3/8", Malleable Iron Beam Clamp, -16 Threaded Openings, Fits Flanges Up To 1" Thick, Supports Threaded Rod, Threaded Brindle Rings & Electrical Boxes, Malleable Iron With Electroplated Bright Zinc Plating, Set Screw Rating 750, Static Load Limit 750 LB, Based On A Safety Factor Of 3, Load Rating Based On Bottom Hole Of Beam Clamp, Torque INLB 120.