Size 4" Weight 4.50 Max. Opening 4" Min. Opening 0" Depth 2-3/8" Screw Dia. 3/4" Test Load 10,000 Lbs. Weight Per Box 4-1/2 Lbs Recommended for heavy industrial and construction work demanding extra strength. Drop forged from selected steel and accurately heat-treated. Steel swivels are securely attached to hardened steel screws. Conforms to Federal Specification GGG-C-406D, Type 1, Class B, medium service.