The Unistrut Cope-Glas Fiberglass Beam Clamp Assembly comes in 3/8", 1/2" or 5/8" sizes. It has a thread shear limit of 500 lbs and a torque limit of 10 ft/lbs. NOTE: Unistrut Cope-Glas Fiberglass Beam Clamp Assembly requires Fiberglass Molded Beam Clips (sold separately).