The Gorilla Gripper is a unique construction tool that allows one person to lift and carry heavy sheet goods (such as plywood, drywall, particleboard, melamine, tempered glass and granite) from the top, with much less strain and greatly reduced risk of injury to the back, neck, shoulders, arms & hands! The gripper works by clamping onto the top of the material, creating a sturdy temporary handle for the person who is carrying them. It allows the user to lift and move them with a straight back, eliminating the requirement of bending over to get under the bottom, thus avoiding the torqued back and the aches and pains that are far too familiar to construction workers and do-it-yourselfers. It's made of aircraft-grade aluminum, very rugged and virtually indestructible. It is continuously self-adjusting from 3/8-inch to 1-1/8-inch. Rubber gripping pads mounted on both plates protect the surfaces of the materials from being damaged or marred. There's just nothing like the Gorilla Gripper...it works!