RAM Double Socket Arm - B Size is a medium double socket arm capable of fitting 1in B size ball bases, holders, and adapters. The knob allows for extensive adjustability of the connected apparatus. Notable features include: standard RAM® double socket arm with an overall length of 3.73in and a socket-to-socket length of 3in. This arm can be attached to any B size RAM® ball component, including bases and holders. Double ball and socket technology offers extensive adjustability of your RAM® mounting system. Made of powder-coated, marine-grade aluminum, this arm exemplifies durability and reliability. Supported by a lifetime warranty, the arm has a weight capacity of 2 lbs under standard use and 1 lb under heavy-duty use.