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 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. It weighs only 7.0 oz. and supports up to 44 lbs. 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.