Jorgensen steel bar clamps are seriously strong Cast iron stationary and sliding heads with an orange, powder coated finish are merged with a highcarbon, rustresistant steel bar that packs a whopping 80000 lbsqin of tensile strength The fast acting sliding head is acme threaded to accommodate a cold drawn steel screw with a large easy grip handle and swivel pad And our original multiple disc clutch design allows the sliding head to hold securely at any point along the bar