Irwin 6" Quick Change Bar Clamp/Spreader is a medium duty 1 handed bar clamp with a 3-3/16" throat depth and a 300 lb clamping force. It tightly holds most irregular shapes and is constructed of an I-beam bar to reduce flexing and bowing. It has a classic pistol grip design and quick release trigger for 1 handed operation. It also has a quick change button to easily convert into a spreader or a specialty clamp with the installation of one of the 1 handed bar clamp accessories.