Description 4" C-Clamp - Heavy Duty | Case of 10 | JETSave Big when you buy case lot 10 per case. Only $58.75 per EACH!. Industrial quality drop forged heat treated steel C-clamps Heavy duty swivel pads are secured by a special retaining clip that is superior to crimped pads Acme threaded screw for smooth operation and even clamping pressure Black oxide screw resists welding spatter Clamping Pressure: 5,300 lb Max. Opening: 4" Throat Depth: 1-3/4"