Constructed from solid aluminum die-casting material with a black powder coating, the Kupo extension arm is a 6" extension arm designed for attaching to the Super Convi Clamp. It allows you to position various gear to the side of a rail, stand, or other mounting position with Super Convi Clamp. The extension arm features a 5/8" (16mm) baby receiver and a removable brass-made 5/8"(16mm) double baby stud with 1/4"-20 and 3/8"-16 male threads. The arm terminates in a hex-shaped stud that securely snaps into a Super Convi Clamp or Super Viser Clamp, preventing the arm from rotating. A must-have esstenial gear for your tool box.