8-1/2" Heavy Service C-Clamp Capacity - J.H. Williams

Especially designed for heavy duty service, frames are drop-forged and heat-treated for maximum strength and reduced springing. Screws are made of special grade steel and are heat-treated for added strength not found in typical case-hardened screws. To tighten, the square headed screw must be turned with a wrench. Ideal for the most demanding applications such as construction and heavy industry. Square head screw allows tightening with wrench for extra heavy duty clamping requirements. Greater anvil surface for gripping larger work pieces and for greater stability