The L.H. Dottie BK38 Beam Clamp features a 0.781-inch jaw capacity and has a 3/8-inch-16 TPI Size. 0.781-inch Jaw Capacity. 5/16-inch diameter x 1-3/8-inch length screw included. Made of steel. Zinc plated finish. Case hardened steel bolt. Tapped threads back and bottom. 6.62 lb. weight. This listing is for a standard package containing 25 units.