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Incorporates a large locking knob. Variable friction and locking of arm obtained by adjusting knob. Ideal for mounting a camera, light, gobo, etc, exactly at the angle you need it. 5/8" male studs on ball joints at both ends with 3/8" and 1/4-20" female thread. Works especially well with 2915 Super Clamp. Length: 20.8"
