The RAM-103U-D consists of the 1.5" C size diameter ball and socket system with one open socket end; RAM-201U-D socket arm is long length at 9.125" end to end with a 8" socket-to-socket length. This mount is designed to be used with any of the C size RAM® Mount bases or cradles with a 1.5" diameter rubber ball. The RAM-202U RAM® Round Plate Ball Base features industry standard AMPS hole pattern with 2.5" diameter base and can be used as an adapter to attach a holder, or a mounting drill-down base.
4-Hole AMPS: 1.181" x 1.496"
3-Hole 120-Degree: 1.812" Diameter
C Size (1.5")
Standard Use: 4 lbs
Heavy-Duty Use: 3 lbs