0.401 Shank THOR Long Barrel Air Hammer/Riveter Maximum power .401 shank air hammer for heavy duty automotive and industrial applications. Specifically developed THOR model with stroke length and ported valvebody for power that matches or beats the top premium options from tool trucks. Newly designed tilt valve trigger for sensitive power adjustment at your fingertips. Features internal brake vibration damping system for less fatigue. No nonsense design: A rotatable forward grip, sensitive trigger and industry leading power. Includes quick change chuck, 10.25 length, Hi-Flo fittings suggested 401K