This Cardellini Clamp can grip round, square, and rectangular tubing up to 2″ in diameter, and it is gentle enough to hold brittle objects like mirrors, glass, or fragile props. Use it to mount lights on pipes, set walls, pieces of lumber, car rigs, drop ceilings, and more.A set of quick-spin knobs makes it faster and easier to set and release this clamp, and it features replaceable rubber pads on the inside of its 3″ jaws that assist with grip and protect surfaces from scratches. The durably designed shaft has a length of 7″, and the threads are resistant to the kind of dings and damage that can impede smooth operation. Weighing only 20 oz, this clamp’s strength-to-weight ratio makes it suitable for mobile applications.