These beam clamps adjust via a screw with a handle to make for easy turning. Use them for the lifting and pulling of steel beams and structures, or as an anchor point. They can be attached upside down and used as a temporary anchor point too. The jaws open and close equally with no real assembly required. The lifting capacity and jaw opening are clearly engraved on the clamp body. Each clamp is made from quality steel components and is backed by great engineering and a 5 Year Warranty.