Bessey GRZRO 4-1/2-Inch Jaw Capacity 2-3/4-Inch Throat Depth Pipe Clamp Gripping Plier Infinitely adjustable jaw Serrated non-slip hardened jaw teeth Rail made of cold drawn profile steel for maximum strength Screw with lock nut on the handle end for clamping pressure adjustment Convenient plastic coated release lever ergonomically designed to eliminate kick-back