Neiko Tools USA 4" C-Clamp with Copper Plated Screw Bridgecraft heavy duty c-clamps are built to last a lifetime. Clamp screws have heavy duty swivel ends to clamp against the work flush and secure. Clamps are heavy duty, manufactured from highest quality materials. Clamps have baked on enamel finish; deeply threaded screws turn smoothly and tighten securely. All Bridgecraft Heavy Duty C-Clamps come with an unconditional 1 year warranty.