506QC CLAMP, 6" QUICK-GRIP BAR/SPREADER | The IRWIN QUICK-GRIP SL300 one-handed bar clamp provides up to 300 lb of sustained clamping force that is evenly distributed through locking swivel jaws. It is constructed with an I-beam bar to reduce flexing and bowing and has a unique pistol grip design and quick-release trigger for one-handed operation. This clamp easily converts to a spreader with a few simple turns of a Quick-Change screw.