Product Description The IRWINQUICK-GRIPOne-Handed Bar Clamp, Medium-Duty, provides up to 300 lbs. of sustained clamping force evenly distributed across removable swivel jaws. It is constructed with an I-beam bar to reduce flexing and bowing, non-marring pads that protect workpieces and can be removed quickly, and a unique pistol grip design with a Quick-Release() trigger for one-handed operation. This clamp easily converts to a spreader with a few simple turns of the quick-change button. From the Manufacturer Irwin Industrial Tools 512QCN 12-Inch Clamp and Spreader Next Generation. New and improved one-handed clamp delivers 300-Pound of sustained clamping force, an I-beam bar and locking swivel jaw