Size 12" Weight 14.78 Max. Opening 12" Min. Opening 0" Depth 5-3/4" Screw Dia. 7/8" Test Load 9,500 Lbs. Weight Per Box 14 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.