All-Lift Systems is a distributor for all major lifting clamp manufacturers: Crosby, Campbell, CM, SuperClamp, J.C. Renfroe, and Terrier Lifting Clamps. Lifting clamps are used to lift and transfer materials and equipment during rigging applications. Screw clamps are designed for vertical and horizontal lifting and transport of many types of steel structures. Don't see the brand or type of screw clamp you are looking for on our website? Please contact us for more information or to request a quote.