U-Turn design is ideal for clamping H beam when welding. - Larger rail sizes & acme spindle for heavy duty applications. - Changeable clamping heads. - Socket drive handle. - Tempered and hot forged steel for rigidity. - Cold drawn profiled steel. Precisely controlled hardening and tempering process over the whole clamp body gives strength for high clamping force. - Nickel and chrome plating for high corrosion resistance