Size 4" Weight 3.17 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. Threads on our screws are Acme roll-threaded for maximum strength and clamping force.