Heavy Duty G-Clamp, 76mm Manufacturers P/N - 18962 - Draper 18969, 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 18969 Heavy Duty G-Clamp, 150mm Manufacturers P/N - 18969