Extend, angle, and easily lock into place your camera mounting solution with this Camera Skate Dolly Arm from Monoprice.This adjustable mounting arm features a ball joint at each end and and adjustable center pivot point. The central locking knob locks and loosens all adjustment points, including the rotation of the ball joints. It employs 1/4x20 thread connections and includes a cold-shoe mount for use with a camera or other shoe-equipped camera mount.The arm is constructed of aluminum and measures about 6 3/8 from the end of each ball joint mounting screw. This arm is specifically intended for use with the Camera Skate Dolly (PID 10274), but can be used with any 1/4x20 or cold-shoe mounting options.*** 30-day easy returns. No restocking fee. Free lifetime technical support. 1 year warranty. ***