1/2" top beam clamp. Top beam clamp. For attaching Superstrut pipe hangers to beams using threaded rod. Malleable iron. Goldgalv electro-plated zinc finish. Clamps have tapped holes in base and back to accept bolt or hanger rod. Jaw openings accomodate I-beam, column, or angle flanges up to 1" thickness. Poly bag of 1 each. Maximum Jaw Opening: 1", Tapping Of Base And Back Holes: 1/2", Base Size: 2-5/8" W x 2-1/2" Base, Trade Size: 1/2", Weight Per 100 LB.: 13, Material: Malleable Iron, Finish: Electroplated Zinc, Pkg Qty: 1, Package Type: Bag