Jorgensen steel bar clamps are seriously strong. Cast iron stationary and sliding heads with an orange, powder coated finish are merged with a high-carbon, rust-resistant steel bar that packs a whopping 80000 lb/sq-in 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.