Size 4" Weight 3.12 Max. Opening 4" Min. Opening 0" Depth 2-3/4" Screw Dia. 3/4" Test Load 6,500 Lbs. Weight Per Box 2-3/4 Lbs. Conforms to Federal Specification GGG-C-406D, Type 1, Class A, light service, deep throat. Spatter-resisting copper plated screw, swivel and crosspin for welding applications.