Designed to securely grip messenger cable. Clamps accept 1/4" (6.6M) to 7/16" (16M) messenger strand. Made from rolled, high quality steel, hot dip galvanized per ASTM A153 for maximum corrosion protection. Furnished with two 1/2" track bolts and square nuts. Mount messenger assembly to pole with a 5/8" bolt thru center hole. Standard Package: 25 each.