Size 4" x 4" Weight 4.75 Opening Depth* 4" x 4" Screw Dia. 3/4" Test Load 4,400 Lbs. Weight Each 4-3/4 Lbs. Forged steel frame and deep throat design makes this an excellent clamp for deep reach, light service. Screw swivel and crosspin are copper plated. Conforms to Federal Specification GGG-C-406D, Type 1, Class A, light service, deep throat.