Our Acratech Quick Release Clamp has a fast double speed rubber knob, it is a full 60mm long and weighs less than 3 ozs (.085kg) and it fits all “Arca-Swiss” compatible plates. This Acratech Quick Release Clamp also features a detent pin to prevent the quick release plate from accidentally sliding out of the quick release clamp in the event the quick release knob is accidentally partially loosened.