If you could only have one clamp for a film, video, photo shoot this is the one you want. Great for rigging lights, nets, flags, props, cameras, microphones, booms, ... basically anything on set. Best of all it is simple to use and provides strong, solid gripping of round, square, or rectangular tubing and many other common and irregular shapes. Jaws open up to 2". Works just as well on a 2x4 or on 1 1/2" pipe found in a studio grid. Essentially the same design as the Cardellini. The differences are: A new ergonomic handle design, reinforced jaws, and the shaft is 1010 chrome plated steel. Available with 2? or 3? Center Jaw or 2? End Jaw. The Center Jaw has a fixed jaw mounted at the base of the Baby Pin portion of the shaft providing strong support for the pin. The End Jaw has the fixed jaw mounted at the end of the threaded portion of the shaft. Superior in tight places! MANUFACTURED UNDER LICENSE, STEVE CARDELLINI, U.S. PATENT NUMBER 5,276,949.