RAM® Round Plate with B-Size Ball The RAM® Round Plate with B-Size Ball is a versatile mounting component featuring a 2.5" round base with integrated 1" rubber ball for compatibility with RAM® double socket arms. Designed with the universal AMPS hole pattern, it can be used as a drill-down mounting base or as an adapter for compatible device holders in vehicle, industrial, and field applications. Key Features • 2.5" round mounting plate with integrated B-size 1" ball • Compatible with RAM® double socket arms and mounting systems • Features standard AMPS hole pattern for universal compatibility • Suitable as a drill-down base or holder adapter • Durable powder-coated marine-grade aluminum construction