Irwin 36" Quick Change Bar Clamp/Spreader has a 3-3/16" throat depth and a 300 lb. clamping force, making it ideal for holding most irregular shapes. The clamp is constructed of an I-beam bar to reduce flexing and bowing, and it has a classic pistol grip design and quick-release trigger for one-handed operation. The quick change button allows you to easily convert the clamp into a spreader or a specialty clamp with the installation of one of the 1 handed bar clamp accessories.