Jorgensen 4 light duty steel bar clamps are strong Castiron stationary and sliding heads with an orangepowdercoated finish are merged with a highcarbon rustresistant steel bar that packs a whopping 85,000 pounds per square inch of tensile strength The fastacting sliding head is acme threaded to accommodate a colddrawn steel screw with a large easygrip handle and swivel pad And our original multiplediscclutch 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 lightduty, mediumduty, and heavyduty applications