Jorgensen POJ3718 18\" Medium Duty Steel Bar Clamp The Jorgensen POJ3718 bar clamps are seriously strong and are made using high quality materials for lasting value and great performance. The high-carbon, rust-resistant steel bar packs a whopping 100,000 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 and swivel pad. The original multiple-disc-clutch design allows the sliding head to hold securely at any point along the bar. These clamps are available in a wide variety of sizes and clamping forces for light-duty, medium-duty, and heavy-duty applications. Features: Typically used by professional cabinet makers, carpenters, woodworkers, metalworkers and by confident DIY\'ers Often used in place of C-Clamps because of their instant adjustability from the sliding head Comfort grip handle  Specification: Max opening: 18\" Reach: 2-1/2\" Load limit: 600lbs Bar: 1/4\" x 3/4\"