Size 8" Weight 7.05 Max. Opening 8" Min. Opening 0" Depth 4-1/2" Screw Dia. 3/4" Test Load 6,900 Lbs. Weight Per Box 8-1/2 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.