Jorgensen steel bar clamps are unbelievably strong and packs a whopping 80 000 pounds per square inch of tensile strength.FEATURESCast-iron stationery and sliding heads with an orange, powder-coated finish are merged with a high-carbon, rust-resistant steel barThe fast-acting sliding head is acme threaded to accommodate a cold-drawn steel screw with a large easy-grip handle and swivel pad.Our original multiple-disc-clutch design allows the sliding head to hold securely at any point along the bar.Available in a wide variety of sizes and clamping forces for light-duty, medium-duty, and heavy-duty applications.