Irwin 12" Quick-Grip Bar Clamp Spreader has a 300 lb. clamping force and a 3-3/16" throat depth, making it ideal for use on a variety of materials. The clamp is made of plastic and has a black/blue body. It has a pistol grip design and a quick release trigger for one-handed operation. It also has a quick change button to easily convert into a spreader or specialty clamp with installation of 1 handed bar clamp accessories. The Irwin QUICK-GRIP SL300 single handed bar clamp provides up to 300 pound 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 single handed operation. This clamp easily converts to a spreader with a few simple turns of a Quick-ChangeTM screw.