Size 10-1/2" Weight 29.00 Max. Opening 10-1/2" Min. Opening 0" Depth 4-1/8" Screw Dia. 1-1/8" Test Load 35,000 Lbs. Weight Per Box 29 Lbs. Frame is forged from high-strength, heat-treated steel. Large diameter screws are full length and hardened to prevent bending and protect threads. Clamp strengths exceed test loads shown. Conforms to Federal Specification GGG-C-406D, Type 1, Class B, heavy service.