How we researched this guide
We compared four RAM Mounts alternatives with verified Amazon listings — the drill-down X-Grip, suction X-Grip, U-bolt X-Grip and Quick-Grip XL holder — against maker and listing specifications, checking base type, arm length, cradle range, materials and stated vehicle compatibility. Every figure below comes from those records; where a maker publishes nothing, this guide says so.
We reviewed owner-facing listing pages and RAM mount guidance for recurring reports on hold security and surface limits. We do not buy or bench-test mounts; no claim here rests on testing by us, and every surface warning should be checked against your own console before relying on a mount offshore.
The 30-second answer
For boats, the alternatives to a generic GPS mount are the RAM Mounts X-Grip Large Phone Mount with Drill-Down Diamond Base (RAM-B-102-UN10U); RAM Mounts X-Grip Large Phone Mount with Twist-Lock Suction Cup (RAM-B-166-C-UN10U); RAM Mounts X-Grip Phone Mount with Handlebar U-Bolt Base (RAM-B-149Z-UN7U); RAM Mounts Quick-Grip XL Phone Holder with Ball (RAM-HOL-PD4-238AU). On a boat, the base decides everything: bolt it where you can, suction it only on smooth surfaces, clamp it where rails exist, and always use the tether.
Best for Boats
RAM Mounts X-Grip Large Phone Mount with Drill-Down Diamond Base (RAM-B-102-UN10U)
Best if the mount must survive a boat: a drill-down diamond base that bolts to the console, a medium arm, and the spring-loaded X-Grip cradle — with Boat listed among its compatible vehicle types.
Best No-Drill
RAM Mounts X-Grip Large Phone Mount with Twist-Lock Suction Cup (RAM-B-166-C-UN10U)
Best if drilling is not an option: a 3.3-inch Twist-Lock suction cup base, a long double socket arm, and the X-Grip large cradle for smooth, non-porous surfaces.
Best for Rails
RAM Mounts X-Grip Phone Mount with Handlebar U-Bolt Base (RAM-B-149Z-UN7U)
Best if your boat has rails: a zinc-coated U-bolt base that clamps rails from 0.5 to 1.25 inches, with a medium arm and the X-Grip cradle.
Best for Large Devices
RAM Mounts Quick-Grip XL Phone Holder with Ball (RAM-HOL-PD4-238AU)
Best if your device is large: a Quick-Grip XL holder with adjustable side keepers that fits large phones and GPS units, on a B-size ball diamond base.
| Product | Standout spec | Best for | Check Price |
|---|---|---|---|
| RAM Mounts X-Grip Large Phone Mount with Drill-Down Diamond Base (RAM-B-102-UN10U) | Drill-down base, boat-rated | Bolted boat consoles | Check Price |
| RAM Mounts X-Grip Large Phone Mount with Twist-Lock Suction Cup (RAM-B-166-C-UN10U) | 3.3-in suction, long arm | No-drill smooth surfaces | Check Price |
| RAM Mounts X-Grip Phone Mount with Handlebar U-Bolt Base (RAM-B-149Z-UN7U) | U-bolt, 0.5–1.25 in rails | Boat rails and handlebars | Check Price |
| RAM Mounts Quick-Grip XL Phone Holder with Ball (RAM-HOL-PD4-238AU) | XL holder, B-size ball | Large phones and GPS units | Check Price |
Boat mount finder: match the mount to your helm
Tell us your console, your device and whether you can drill. Every result recommends a pick from this guide, with its button. This finder is a starting point, not a seaworthiness test.
Answer the questions above, then press the button.
How to choose a GPS mount alternative for a boat
Base type decides everything
A boat mount lives or dies by its base: drill-down bases hold anywhere drilling is allowed, suction holds only on smooth non-porous surfaces, and U-bolt bases need a rail. Choose the base for your console first, then the cradle — never the reverse. See our wireless OBD GPS trackers guide.
Suction limits, honestly
Suction cups fail on textured, porous, curved or dirty surfaces, and heat and chop shorten their hold. If your console is textured or you run rough water, suction is a backup, not a primary mount — bolt or clamp instead.
Cradle versus keeper
Four-leg X-Grip cradles grip most phones with cases; keeper-style Quick-Grip holders grip large phones and dedicated GPS units more securely. Match the holder to the device’s size and weight, with its case on.
Tether on every trip
RAM includes a device tether with X-Grip cradles for outdoor use, and on a boat it is not optional: a dropped phone overboard is gone. Rig the tether before leaving the dock, not after the first wave.
Vibration and visibility
Long arms reach over console lips but vibrate more in chop; medium arms hold steadier. Position the device where the helmsman reads it without blocking navigation lights, compass or throttle travel.
Modularity pays off
The RAM ball system lets one holder move between a boat base, a rail base and a vehicle base by swapping arms and bases. Buying into one ball size keeps future mounts cheaper than buying a new system per vehicle.
Boat GPS mount alternatives at a glance
Base types, cradle ranges and materials are taken from maker and listing records for each mount.
| Mount | Base | Cradle | Source |
|---|---|---|---|
| RAM drill-down | Drill-down diamond | X-Grip large | Maker/listing record |
| RAM suction | 3.3-in Twist-Lock | X-Grip large | Maker/listing record |
| RAM U-bolt | U-bolt 0.5–1.25 in | X-Grip | Maker/listing record |
| RAM Quick-Grip XL | B-size ball base | XL keeper holder | Maker/listing record |
Boat GPS mounts by budget
| Tier | What you get | Example pick |
|---|---|---|
| No-drill | Suction base for smooth panels | RAM suction X-Grip |
| Rail mount | U-bolt base for rails | RAM U-bolt X-Grip |
| Bolted | Drill-down base for consoles | RAM drill-down X-Grip |
| Large device | XL keeper holder, add arm/base | RAM Quick-Grip XL |
Types of boat GPS mounts
| Type | Pros | Cons | Best for |
|---|---|---|---|
| Drill-down | Most secure | Permanent holes | Own boats |
| Suction | No tools, portable | Surface-dependent | Rentals, smooth panels |
| U-bolt rail | No drilling, movable | Needs a rail | Rail helms |
| Keeper holder | Grips large devices | Needs arm + base | GPS chartplotters |
| Adhesive | No tools | Weakest in heat/wet | Temporary use only |
Detailed reviews of the best GPS mount alternatives for boats
Each review below follows the same structure: why it is our pick, its published specifications, fitment, owner reports and who should skip it.
Best for Boats: RAM Mounts X-Grip Large Phone Mount with Drill-Down Diamond Base (RAM-B-102-UN10U)
Best for Boats — A bolted-down X-Grip rated for boat use
Why the RAM Mounts X-Grip Large Phone Mount with Drill-Down Diamond Base (RAM-B-102-UN10U) is our pick
The drill-down X-Grip is the only pick here whose listing explicitly names Boat among compatible vehicle types, and that matters: a suction cup can fail on a wet, textured or curved console, but a bolted diamond base does not. Its marine-grade aluminium, stainless steel components and high-strength composite construction, plus the spring-loaded X-Grip cradle with a device tether for outdoor use, make it the right default for a boat’s helm.
RAM Mounts X-Grip Large Phone Mount with Drill-Down Diamond Base (RAM-B-102-UN10U) key specs
- Part: RAM-B-102-UN10U
- Base: drill-down diamond base
- Arm: medium double socket arm
- Cradle: X-Grip large, spring-loaded
- Width range: 1.75–4.5 inches
- Materials: marine-grade aluminium, stainless steel, composite
- Tether: device tether included for outdoor use
- Compatible vehicles: ATV, Automobile, Boat, Truck
- Mounting: drill-down
- Best for: boat consoles
RAM Mounts X-Grip Large Phone Mount with Drill-Down Diamond Base (RAM-B-102-UN10U): fits and best for
Best for boat consoles where drilling is acceptable, for helms that get wet and rough, and for phones and small GPS units within the 1.75–4.5 inch width range. It suits owners who want the mount to stay put in chop.
RAM Mounts X-Grip Large Phone Mount with Drill-Down Diamond Base (RAM-B-102-UN10U) pros and watch-outs
- Bolted base cannot suction-fail
- Boat explicitly listed as compatible
- Marine-grade materials
- Tether included for outdoor use
- X-Grip fits phones with cases
- Requires drilling into the console
- Not transferable between vessels
- Not water resistant as a unit
- Large cradle dominates small consoles
RAM Mounts X-Grip Large Phone Mount with Drill-Down Diamond Base (RAM-B-102-UN10U): what owners report
- Owners in listing pages report the X-Grip holds devices securely outdoors with the tether — RAM drill-down listing
- RAM’s own mount guidance stresses the tether for outdoor applications — RAM X-Grip mount guidance (retailer)
RAM Mounts X-Grip Large Phone Mount with Drill-Down Diamond Base (RAM-B-102-UN10U): who should not buy
Skip it if you cannot drill the console — the suction X-Grip below is the no-drill alternative — or if you move the mount between vessels daily.
RAM Mounts X-Grip Large Phone Mount with Drill-Down Diamond Base (RAM-B-102-UN10U): pair it with
Pair it with a waterproof phone case for open-boat use, since the mount itself is not water resistant.
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Use the tether on every open-water trip, even on calm days. See our guide on MagSafe car mounts reviews
Best No-Drill: RAM Mounts X-Grip Large Phone Mount with Twist-Lock Suction Cup (RAM-B-166-C-UN10U)
Best No-Drill — A 3.3-inch Twist-Lock suction base with a long arm
Why the RAM Mounts X-Grip Large Phone Mount with Twist-Lock Suction Cup (RAM-B-166-C-UN10U) is our pick
The suction X-Grip trades permanence for flexibility: its 3.3-inch Twist-Lock suction cup locks to smooth glass or non-porous panels without tools, and its long arm reaches over console lips and instrument shrouds. The same marine-grade aluminium and stainless construction and the same X-Grip cradle with tether carry over, so the only real compromise is surface dependence — suction holds only on smooth, non-porous surfaces, never on textured or fabric ones.
RAM Mounts X-Grip Large Phone Mount with Twist-Lock Suction Cup (RAM-B-166-C-UN10U) key specs
- Part: RAM-B-166-C-UN10U
- Base: 3.3-inch Twist-Lock suction cup
- Arm: long double socket arm
- Cradle: X-Grip large, spring-loaded
- Width range: 1.75–4.5 inches
- Materials: marine-grade aluminium, stainless steel, composite
- Tether: device tether included
- Suits: vehicle windshields, smooth panels
- Mounting: suction, no tools
- Best for: no-drill mounting
RAM Mounts X-Grip Large Phone Mount with Twist-Lock Suction Cup (RAM-B-166-C-UN10U): fits and best for
Best for rented boats, borrowed vessels and smooth fibreglass or glass panels where drilling is forbidden. It does not suit textured, porous or curved console surfaces — test the suction spot before relying on it.
RAM Mounts X-Grip Large Phone Mount with Twist-Lock Suction Cup (RAM-B-166-C-UN10U) pros and watch-outs
- No drilling or tools needed
- Transfers between vessels
- Long arm clears console lips
- Same X-Grip cradle and tether
- Marine-grade materials
- Suction fails on textured surfaces
- Needs re-checking in heat and chop
- Less secure than a bolted base
- Long arm can vibrate on rough water
RAM Mounts X-Grip Large Phone Mount with Twist-Lock Suction Cup (RAM-B-166-C-UN10U): what owners report
- Owners in listing pages report the suction base holds on smooth glass when clean — RAM suction listing
- Retailer guidance confirms suction needs smooth, non-porous surfaces — RAM suction mount guidance
RAM Mounts X-Grip Large Phone Mount with Twist-Lock Suction Cup (RAM-B-166-C-UN10U): who should not buy
Skip it as the only mount on a rough-water boat — bolt the drill-down base instead — or if your console surface is textured.
RAM Mounts X-Grip Large Phone Mount with Twist-Lock Suction Cup (RAM-B-166-C-UN10U): pair it with
Pair it with the drill-down base on your own boat, keeping suction for rentals.
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Clean the suction spot and the cup before every trip. See our guide on MagSafe mount alternatives
Best for Rails: RAM Mounts X-Grip Phone Mount with Handlebar U-Bolt Base (RAM-B-149Z-UN7U)
Best for Rails — A U-bolt base for rails from 0.5 to 1.25 inches
Why the RAM Mounts X-Grip Phone Mount with Handlebar U-Bolt Base (RAM-B-149Z-UN7U) is our pick
Many boats have rails and almost no flat console space, which is where the U-bolt X-Grip wins: its zinc-coated U-bolt base clamps rails from 0.5 inches upward (with a second U-bolt for 1 to 1.25-inch rails), and the medium arm positions the X-Grip cradle where the helmsman can see it. The same spring-loaded cradle, marine-grade materials and outdoor tether carry over, and the mount moves between rail positions without tools beyond the U-bolt itself.
RAM Mounts X-Grip Phone Mount with Handlebar U-Bolt Base (RAM-B-149Z-UN7U) key specs
- Part: RAM-B-149Z-UN7U
- Base: zinc-coated U-bolt base
- Rails: 0.50–1.00 in and 1.00–1.25 in U-bolts
- Arm: medium socket-to-socket, 3 inches
- Cradle: X-Grip, spring-loaded
- Width range: 1.875 inches and up (cradle)
- Materials: marine-grade aluminium, stainless steel, composite
- Tether: device tether included
- Mounting: handlebars and rails
- Best for: rail mounting
RAM Mounts X-Grip Phone Mount with Handlebar U-Bolt Base (RAM-B-149Z-UN7U): fits and best for
Best for boats with grab rails or pipe rails at the helm, for centre consoles with rail space, and for owners who also ride motorcycles or ATVs and want one mount across vehicles.
RAM Mounts X-Grip Phone Mount with Handlebar U-Bolt Base (RAM-B-149Z-UN7U) pros and watch-outs
- Clamps rails without drilling
- Two U-bolt sizes included
- Moves between rail positions
- Same X-Grip cradle and tether
- Marine-grade materials
- Needs a suitable rail at the helm
- U-bolt can mark rails if over-tightened
- Medium arm reach is fixed
- Not for flat consoles without rails
RAM Mounts X-Grip Phone Mount with Handlebar U-Bolt Base (RAM-B-149Z-UN7U): what owners report
- Owners in listing pages report the U-bolt base fits rails securely — RAM U-bolt listing
- RAM guidance notes the tether for outdoor applications across X-Grip models — RAM X-Grip guidance
RAM Mounts X-Grip Phone Mount with Handlebar U-Bolt Base (RAM-B-149Z-UN7U): who should not buy
Skip it if your helm has no rails — the drill-down or suction base suits flat consoles — or if your rails fall outside the U-bolt range.
RAM Mounts X-Grip Phone Mount with Handlebar U-Bolt Base (RAM-B-149Z-UN7U): pair it with
Pair it with rail padding if your rails are polished and you want to avoid clamp marks.
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Check U-bolt tightness after the first rough-water trip. See our guide on wireless OBD GPS trackers
Best for Large Devices: RAM Mounts Quick-Grip XL Phone Holder with Ball (RAM-HOL-PD4-238AU)
Best for Large Devices — A spring-loaded holder for large phones and GPS units
Why the RAM Mounts Quick-Grip XL Phone Holder with Ball (RAM-HOL-PD4-238AU) is our pick
The Quick-Grip XL answers the size question the X-Grip leaves open: its adjustable side keepers secure larger phones and devices such as Garmin DriveSmart and DriveTrack units within its height range of 5.75 inches and up, and its B-size (1-inch) ball diamond base plugs into the whole RAM modular system. For a boat running a dedicated GPS or a large phone as a chartplotter, this holder’s keeper design grips more securely than a four-leg cradle alone.
RAM Mounts Quick-Grip XL Phone Holder with Ball (RAM-HOL-PD4-238AU) key specs
- Part: RAM-HOL-PD4-238AU
- Holder: Quick-Grip XL, spring-loaded
- Height range: 5.75 inches and up
- Keepers: adjustable side keepers
- Ball: B size, 1 inch, diamond base
- Materials: marine-grade aluminium, composite
- Water resistance: water resistant (holder)
- Compatible: large phones, Garmin Drive units
- Mounting: diamond ball base
- Best for: large devices
RAM Mounts Quick-Grip XL Phone Holder with Ball (RAM-HOL-PD4-238AU): fits and best for
Best for boats using a large phone or a Garmin GPS as a chartplotter, for owners already in the RAM B-size ball system, and for helms where a keeper-style holder grips better than a cradle in chop.
RAM Mounts Quick-Grip XL Phone Holder with Ball (RAM-HOL-PD4-238AU) pros and watch-outs
- Fits large phones and GPS units
- Adjustable side keepers
- B-size ball joins RAM system
- Marine-grade materials
- Water resistant holder
- Holder only — needs an arm and base
- Larger footprint than X-Grip
- Keepers need adjustment per device
- Not a complete mount out of the box
RAM Mounts Quick-Grip XL Phone Holder with Ball (RAM-HOL-PD4-238AU): what owners report
- Owners in listing pages report the XL holder fits large phones and Garmin units — RAM Quick-Grip XL listing
- RAM’s holder guidance lists compatible Garmin and phone models — RAM holder guidance (retailer)
RAM Mounts Quick-Grip XL Phone Holder with Ball (RAM-HOL-PD4-238AU): who should not buy
Skip it if you need a complete mount in one box — the drill-down X-Grip is complete — or if your device is small, where the standard X-Grip grips better.
RAM Mounts Quick-Grip XL Phone Holder with Ball (RAM-HOL-PD4-238AU): pair it with
Pair it with a RAM B-size arm and the base that suits your console or rail.
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Adjust the side keepers to the device with its case on. See our guide on GPS trackers guide
Spec comparison: GPS mount alternatives for boats
| Spec | RAM drill-down | RAM suction | RAM U-bolt | RAM Quick-Grip XL |
|---|---|---|---|---|
| Part | RAM-B-102-UN10U | RAM-B-166-C-UN10U | RAM-B-149Z-UN7U | RAM-HOL-PD4-238AU |
| Base | Drill-down | 3.3-in suction | U-bolt | B ball base |
| Arm | Medium | Long | Medium 3-in | None (holder) |
| Cradle | X-Grip large | X-Grip large | X-Grip | Quick-Grip XL |
| Width range | 1.75–4.5 in | 1.75–4.5 in | 1.875 in up | 5.75-in height up |
| Materials | Marine-grade | Marine-grade | Marine-grade | Marine-grade |
| Tether | Yes | Yes | Yes | Not listed |
| Boat listed | Yes | Not stated | Not stated | Not stated |
| Check Price | Check Price | Check Price | Check Price | Check Price |
Cells are kept short so the table stays readable on mobile, and every table in this guide has five columns or fewer.
Installation and use basics
Drill-down bases need a pilot hole, sealant on the fasteners and a check that nothing vital sits behind the console panel; suction bases need a clean, smooth, dry spot and a twist-lock set with full pressure; U-bolt bases need the right U-bolt size for the rail and even tightening. In all cases, fit the device with its case on, adjust keepers or cradle arms to it, rig the tether, and test full steering and throttle travel before leaving the dock. Related reading: MagSafe car mounts reviews, MagSafe mount alternatives and GPS trackers.
Safety essentials
- Rig the device tether before leaving the dock, every trip.
- Never block navigation lights, compass or throttle travel.
- Test suction holds before relying on them offshore.
- Seal drill holes against water intrusion.
- Check U-bolt tightness after the first rough-water trip.
- Use a waterproof case on open boats.
Three companion picks from this guide, each with its own button:
- Check Price — RAM drill-down X-Grip for bolted consoles
- Check Price — RAM suction X-Grip for no-drill panels
- Check Price — RAM U-bolt X-Grip for rails
For the wider mount family, see our GPS mounts archive and motorcycle and powersports archive.
Boat GPS mount troubleshooting
| Symptom | Likely cause | Fix |
|---|---|---|
| Suction releases underway | Textured or dirty surface | Move to smooth spot, clean cup, or bolt down |
| Device vibrates unreadably | Long arm in chop | Switch to medium arm, tighten ball joints |
| Cradle will not grip | Device too large or cased wrong | Re-measure with case; switch to XL keeper |
| U-bolt slips on rail | Wrong U-bolt size | Fit the matching U-bolt size for the rail |
| Mount blocks throttle | Poor placement | Reposition before leaving dock |
| Phone overheats in sun | Direct sun on helm | Shade the device, use ventilated case |
Who should NOT buy these
Do not buy a car suction mount for a boat and expect it to hold. Boat consoles are often textured and wet; a car mount’s suction assumptions fail there — see our mount alternatives guide for base-type thinking.
Do not buy a holder without its arm and base. The Quick-Grip XL is a holder only; budget the arm and base it needs. See our heavy-duty GPS trackers guide.
Do not buy on cradle size alone. The base decides whether the mount stays on the boat at all; choose the base first. See our wireless OBD GPS trackers under 150 guide.
Do not skip the tether. A mount without a tether on open water risks the device on the first serious wave. See our fleet GPS trackers guide.
Final verdict
Best for Boats: RAM Mounts X-Grip Large Phone Mount with Drill-Down Diamond Base (RAM-B-102-UN10U) — Check Price
Best No-Drill: RAM Mounts X-Grip Large Phone Mount with Twist-Lock Suction Cup (RAM-B-166-C-UN10U) — Check Price
Best for Rails: RAM Mounts X-Grip Phone Mount with Handlebar U-Bolt Base (RAM-B-149Z-UN7U) — Check Price
Best for Large Devices: RAM Mounts Quick-Grip XL Phone Holder with Ball (RAM-HOL-PD4-238AU) — Check Price
FAQ
What is the best GPS mount alternative for a boat?
A RAM X-Grip with the base that suits your helm: drill-down for your own boat’s console, suction for smooth rented panels, U-bolt for rails, and the Quick-Grip XL holder for large phones or dedicated GPS units. The drill-down base is the default where drilling is allowed, since Boat is explicitly listed among its compatible vehicles. See our OBD GPS trackers review.
Will a suction cup mount hold on a boat?
Only on smooth, non-porous surfaces that are clean and dry at fitting, and even then it needs re-checking in heat and chop. Suction fails on textured, porous or curved consoles, so treat it as a portable or rental solution, not a rough-water primary mount.
Can I use a phone as a boat GPS?
Yes, with a waterproof case, a secure mount and a tether, and with charts downloaded for offline use where signal fails. A phone is not a substitute for proper marine navigation equipment on waters that require it — check local requirements. See our GPS tracker under 1000 guide.
What size device fits an X-Grip?
The large X-Grip fits devices from 1.75 to 4.5 inches wide, including most phones with cases. Larger phones and dedicated GPS units suit the Quick-Grip XL holder, whose adjustable keepers cover a 5.75-inch height range and up.
Do I need to drill my boat console?
Not always: suction and U-bolt bases avoid drilling, but they need the right surface or rail. If your console is textured and has no rails, drilling a diamond base — sealed against water — is the reliable answer.
What is the device tether for?
The tether is a strap that keeps the device attached to the mount if the cradle releases, which matters most on open water where a dropped device is lost. RAM includes it with X-Grip cradles for outdoor use; rig it on every trip.
Are RAM mounts waterproof?
The mounts use marine-grade aluminium, stainless steel and composite, but the mount unit itself is generally not rated water resistant — the Quick-Grip XL holder is described as water resistant. Protect the device itself with a waterproof case on open boats.
Can one RAM mount move between boat and car?
Yes, within the ball system: the same cradle or holder can move between a boat base, a rail base and a vehicle base by swapping arms and bases. Keep to one ball size (B-size, 1 inch, for the picks here) so parts interchange.
Why does my mount vibrate so much?
Long arms vibrate more in chop, and loose ball joints amplify it. Switch to a medium arm, tighten all ball joints, and position the device close to the base rather than at full arm extension.
Sources
- RAM drill-down — Amazon listing (ASIN B00JUW8Z1K)
- RAM suction — Amazon listing (ASIN B0117SE7CK)
- RAM U-bolt — Amazon listing (ASIN B006X387ZS)
- RAM Quick-Grip XL — Amazon listing (ASIN B07V6ZS2HG)
- RAM X-Grip mount guidance (retailer)
By Leo, Founder, WinchInsider
Leo researches automotive tools and recovery gear from maker specifications and owner reports, and writes buying guides that favour verified fitment over hype.
Related guides
- MagSafe Car Mounts Reviews Amazon
- Alternatives to MagSafe Car Mounts
- Best Wireless OBD GPS Trackers Under 300
- Best GPS Tracker Under 500
- OBD GPS Trackers Review for Cars
- GPS Mounts archive
Top pick: RAM Mounts X-Grip Large Phone Mount with Drill-Down Diamond Base (RAM-B-102-UN10U)
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