The RAM® Large Round Plate with Ball – D Size (RAM-D-202U) features a 3.68" diameter round plate with an integrated 2.25" rubber ball. Compatible with all D size RAM® components, this base can be attached to a device with a matching hole pattern or drilled down to a flat surface for permanent installation. The pre-drilled hole pattern includes two holes at 180 degrees and three holes at 120 degrees, providing multiple mounting options.