Bessey TG series cast bar clamps have an integrated anti-slip system which consists of a set screw molded into the sliding arm which interlocks with the high-quality German steel rail serrations to prevent the clamp from slipping. The top jaw is press fit into the rail, this combination provides maximum safety for your clamping needs. The clamps are available in either a tried-and-true wooden handle or the 2K composite handle with a comfort insert. This whole system equates to a clamp that is extremely rigid and durable providing years of use.