Jorgensen 2-Pack Steel Bar Clamps Set, 12-Inch Medium Duty, 600, For Woodworking The throat depth is 2-1/2 inch, the maximum opening capacity is 12 inch and the Normal load limit is 600 lbs. Sliding head design makes this style fast acting: the sliding head is threaded to accommodate the screw with large easy grip handle and swivel pad. Multiple-Disc-Clutch design consist hardened plated steel clutch disc and one spring which allows the sliding head to hold securely at any point along the bar. With soft and durable plastic pads, steel bar is plated to be rust resistant and the iron castings have an orange baked enamel finish. Designed for all types of medium-duty clamping, and Ideal for hobbyist, carpenters, woodworkers, metalworkers and professional trades people of all types.