Double Socket Arm for 1" Ball, Plastic - Recommended
Note: I recommend this arm for most applications that require 1" (B size) balls because it is a medium length, light weight due to its plastic construction, and inexpensive. Don't think that it is not strong because it is made of plastic - it is very rugged. The arm has a socket at either end to allow a 1" diameter ball (size "B") accessories to be connected. A tightening screw on the side of the arm enables the sockets to clamp firmly on a 1" diameter ball. When loosening the side screw, a single spring inside the arm opens the socket for maneuvering of the mount, or removing of the ball from the socket.
Length (center of socket to center of socket): 3.0 inches (76.2 mm)
Length with 2 x RAM-B-238U bases: 5.0 inch (128 mm)
Length with 2 x RAP-B-238U bases: 5.4 inches (137 mm)
Weight: 3.4 oz (96 g)