Multi-sized clamp

A multi-sized clamp capable of attaching to various sized cylindrical objects such as iris rods of a professional movie camera. The multi-sized clamp includes a pair of clamp jaws connected by a hinge and a pivotable adjustment rod. The clamp jaws' interior surfaces include curved surfaces having at least two different diameters. The clamp jaws are opened by turning the pivotable adjustment rod in one direction and closed by turning it in the opposite direction. One of the clamp jaws also contains a body that also has an opening and an L-shaped split above the opening with a closing mechanism running through the body above the opening and through the split. The closing mechanism when turned in one direction increases the opening and decreases the opening when turned in the opposite direction, thus allowing other equipment to be attached to the clamp through the opening.