Description

They are typically made of steel or cast iron, at the bottom is a threaded hole through which a large threaded screw protrudes, one end of this screw contains a flat edge of similar size to the one at the top of the frame, and the other end usually a small metal bar, perpendicular to the screw itself, which is used to gain leverage when tightening the clamp . A G-clamp is used by means of turning the screw through the bottom of the frame until the desired state of pressure or release is reached.