Variable speed controlled by trigger 330Nm maximum fastening torque and 580Nm nut busting torque, to provide fastening control for a wide range of applications Trigger switch featuring full speed mode ½” square pin detent driving shank Electronic 4 stage impact power selections with easy to use applications modes Push a button for max, hard, medium and soft mode, full speed mode Auto-Stop mode Three modes of reaction time for automatic stop available in both forward and reverse rotation modes Phosphorescent bumper designed to glow in dark spaces Standard bolt capacity M10 to M20, high strength bolt M10 to M16