AMPS Compatible 20mm Ball with Metal Mounting Plate

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.

Bulletpoint AMPS Pattern Standard Dimensions


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 as well as our Ford F-Series Mounts.

Shown below is our RubiGrid with Two 4-Hole AMPS Plate & Ball Assemblies to demonstrate what is possible.

Customer Reviews

Based on 38 reviews
Chad Morrell
Best phone holder there is.

I have tried many different phone holders and bases. This is the best one that I have found. Very well made, should last for a long time. The only one that I will ever buy again.

John B
Good stuff

Ordered this for my wife’s Jeep. The website page was kind of confusing figuring out what was what and what to order. Figured it all out though pretty quick. She likes the set up. Good products!

Mike Gardner
Phone holder and ball mount

Best damn phone holder ever! Well worth the money. Holds my phones and gopro nicely.! couldnt be happier. Next looking for a mount for a dash cam.....

Marty Wilkinson
Awesome Mount

I installed the mount to my Builtright mount in my F150. I love it. Super steady, looks great, works great! Could not be happier!

Rodney Mayer
Give your dash some balls.

I added a third ball to my F-150’s Bullet point. It’s a few minutes to install and rock solid. The ball and plate design allows you to mount a ball just about anywhere on anything.