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RAM Mounts - Arm Sizes

RAM Arm Sizes

Arm Sizes Short Arm Medium Arm Long Arm
Overall Length
2.42" / 6.14cm
3.73" / 9.47cm
6" / 15.24cm
Socket to Socket Length
1.75" / 4.45cm
3" / 7.62cm
5.31" / 13.49cm

RAM Diamond Ball Base | B Size



*Please Note: Mounts/ Cradle featured in Images are not included.

In stock

Sizing Guide

The RAM Diamond Ball Base has a B size rubber ball. The base can be used on wide variety of RAM® device holders and cradles.

The RAM Diamond Ball Base consists of a 1″ / 2.54cm B size rubber ball. This connects to a 2.43″ / 6.17cm / 6.17cm x 1.31″ / 3.33cm / 3.33cm diamond plate. The diamond plate features two holes that measure 1.912″ / 4.86cm from centre to centre. These match the industry-standard AMPS hole pattern.


  • Diamond plate features industry-standard AMPS hole pattern and measures 2.43″ / 6.17cm / 6.17cm x 1.31″ / 3.33cm / 3.33cm
  • Compatible with several RAM® device holders and cradles
  • Hole Pattern: 2-Hole AMPS: 1.912″ / 4.86cm
  • Ball size: B Size (1″ / 2.54cm)
  • Ball and socket technology allows for near-infinite adjustability
  • Screw size for plate holes: #8, #10, M4 or M5 screws (not included)
  • If Pairing with any RAM® Holder, the holder will come with the necessary hardware to connect to your mount.
  • Made of powder-coated, marine-grade aluminium for durability and reliability in the most demanding environments
  • Weight Capacity: Standard Use: 2 lbs / 0.907kg | Heavy-Duty Use: 1 lb / 0.454kg
  • Weight: 0.1 lb / 0.045kg
  • Backed by a lifetime warranty

Check out other RAM products: RAM Tough-Claw Double Ball Mount with Camera Adapter


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