Super viser clamp is built withan aluminum die casting body making it sturdy and lightweight. The moveable jaws are designed for mounting on the tubes or planks up to 101mm (228mm is available for the longer 9" version kg603012). Withthe innovative grooved design on the threaded shaft, both jaws can be kept in the same direction all the way. In addition to the 16mm pin terminated at the end of shaft, the unique design of a 16mm socket is also built on the clamp that allows all convi clamp accessories to fit onto the super viser.