RAM® Chrome Diamond Ball Base RAM-B-189B-FRO1 The mount is designed with

The mount is designed with a B size 1" diameter rubber ball and socket system that has adjustment points at both ends of the double socket arm

All four arms feature rubber-coated caps that hold your phone firmly in place

The RAM-B-217U provides 2 B-size balls on with a 1/4" NPT Female threaded post

5" diameter ball

The RAM-2461U consists of a C size 1

RAM® Chrome Diamond Ball Base RAM-B-189B-FRO1 The mount is designed withThe chrome plated base contains a 1" diameter rubber ball connected at right angles to a 2. 43" x 1. 31" diamond base. The base has two holes 1. 912" from center to center, positioned at both ends of the diamond base.