Lot of 8 - you get all 8 for one purchase price. Round plate with ball: RAM-B-202U (universal AMPS hole pattern)

The RAM® Round Plate with Ball (RAM-B-202U) features an integrated B size rubber ball compatible with RAM® socket arms. The 2.5" round plate has pre-drilled holes in accordance with the universal AMPS hole pattern. This versatile component can be used as a drill-down base or as an adapter for compatible RAM® device holders.

Features

Hole pattern: 4-Hole AMPS: 1.181" x 1.496", 3-Hole 120-Degree: 1.812" Diameter

Plate size: 2.5" Diameter

Ball size: B Size (1")

Materials: Marine-grade aluminum