Heavy Duty G-Clamp, 76mm Manufacturers P/N - 18962 - Draper 18979, This robust G-Clamp has a malleable cast iron frame and a powder coated finish for durability.The swivel shoe helps clamp on uneven surfaces.There is a silver plated square thread screw, tommy bar handle and swivel shoe. Draper 18979 Heavy Duty G-Clamp, 350mm Manufacturers P/N - 18979