Accept no imitations! This is the original Super Clamp that has thousands of uses! The Super Clamp holds just about everything: cameras, lights, umbrellas, hooks, shelves, plate glass, cross bars, even other Super Clamps! And they hold these items to just about everything: poles, posts, tripod legs, pipes, doors, stands, and beams - virtually any support you can get the Super Clamps wide jaws around. This universal clamp can be securely mounted on any tube from .5 to 2.1. Supplied with a unique wedge insert for clamping onto flat surfaces. A built-in socket allows the use of over 30 attachments to hold anything from backgrounds to lighting fixtures. Stud not included.