Jorgensen steel bar clamps are seriously strong. Cast-iron stationary & sliding heads with an orange, powder coated finish are merged with a high-carbon, rust-resistant steel bar that packs a whopping 80,000 pounds per square inch of tensile strength. The fast-acting sliding head is acme threaded to accommodate a cold-drawn steel screw with a large easy-grip handle & swivel pad. Jorgensen's 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 & clamping forces for light-duty, medium-duty, & heavy-duty applications.