Malleable iron beam clamps with extra wide 3-1/8 in jaw opening and 3/8-16 threaded holes are used with conduit hangers, bridle rings and drop 3/8-16 rods. They are tapped for rods on the bottoms and backs. GARVIN® Industries' heavy duty beam clamps are used to hang medium, light or heavy loads from structural beams. Their hardened cup point screw and malleable iron body will not distort or slip off beam edge when tightened.