From the Manufacturer
Great for quick, easy set-ups for welding or assembling plates, angle iron, square tubing, pipe and channel iron. One Handed, Self-Centering Jig and Fixture Clamp, 2-1/2-Inch Jaw Height, 4.5-Inch Jaw Length, 4-Inch for -InchT-Inch Joints, 4-3/4-Inch Miter Joints Each Side