AMPS Compatible 20mm Ball with Metal Mounting Plate

Note: 4-hole AMPS balls shipped after August 15, 2022, feature our redesigned base.

Each AMPS Plate and 20mm Ball Joint Assembly comes with Heavy Duty Bolts and Nylon Locking Nuts so you get everything required for a rock solid installation.

Hole locations are in the standard AMPS pattern of 30mm x 38mm (1.181” x 1.496”) so this will mount to anything with the AMPS hole configuration.

The ball size is 20mm and is compatible with our Carbon Fiber + Kevlar Mounting Arms and our GoPro Mount.


Choose between our rectangular 4-hole plate or 2-hole plate depending on your needs. 4-holes AMPS balls are recommended for maximum stability with phone and tablet holders. 2-hole AMPS are suitable for lightweight action cameras and other lightweight devices.


The base is made from precision laser-cut metal and features a thin rubber strip to help absorb and reduce unwanted vibrations as well as prevent scratching with the mounting surface.

The 20mm machined ball is also made from metal and features grooves to help provide additional friction and grip so your device won't spin or move.


These plate and ball assemblies are fully compatible with our RubiGrid™ Platform Base for the Jeep Wrangler JL and Gladiator, RAM Truck RubiGrid™, RubiGrid™ for GMC Sierra & Chevrolet Silverado as well as our Ford F-Series Mounts.

Shown below are 3 of our RubiGrid™ systems with the 4-Hole AMPS Plate & Ball to demonstrate what is possible.

Customer Reviews

Based on 128 reviews
Kevin Drysdale
Fits perfectly

Fit the new holder perfectly love the look and the construction of them

Adam Bullard
Looks like a sturdy product

Everything looks great, but when I went to mount it to the truck I ordered it for, 2022 Ram 2500, it didn’t have to screws long enough in the package. From videos I’ve watched it was either supposed to have the screws or I got sent the wrong one on accident. Hopefully I can find screws that work soon

Hello Adam, thank you for taking the time to write a review. I recommend taking a look at the date on the video you watched and most importantly the bases are not the same. We did a design change some time ago to eliminate the need for the longer screws. The new design simply uses the OEM screws in your dash. So you are not missing the long screws. If you have any questions please feel free to reach out to customer support. They can be reached at

Outstanding Support!

I had an issue with one of my 20mm ball mounts and they were fast and friendly at correcting the issue.

David Bennett
Great phone mount

Finally something useful for the big hole in the dash on Silverado. Wish I would have got it sooner. Now I have to go back and get the mount for the GPS

james karam
Best cellphone mount ever

I love my bulletpoint mount so much i bought my brother one. Only thing i regret is not purchasinga passenger side mount.