RAM Double Socket Arm - B Size Medium The RAM-B-201U consists of a medium double socket arm that accommodates 1" B size ball bases, device holders, and adapters. With an overall length 3.73", this is the standard RAM double socket arm size. The easy to adjust knob allows for near-infinite adjustability for your connected device. Standard RAM double socket arm provides an ideal overall length of 3.73in and a socket-to-socket length of 3in Attaches to any B size RAM ball component, including mounting bases and device holders; double ball and socket technology allows for near-infinite adjustability of your RAM mounting system Made of powder-coated, marine-grade aluminum for durability and reliability in the most demanding environments Backed by a lifetime warranty