The Makita DTW285 BL LXT Impact Wrench has a powerful, maintenance free brushless DC motor. With reverse rotation auto stop mode: only when pulling the trigger fully in counter-clockwise rotation. When the bolt/nut gets loosened enough, the tool stops the impact and rotation in 0.2 seconds. Comes as a 18V bare unit, NO battery or charger supplied. Driving Shank: 1/2in Square Drive. No Load Speed: 1,600/2,100/0-2,800/min. Impact Rate: 0-1,800/0-2,600/0-3,500/bpm. Nut Busting Torque: 400Nm. Bolt Capacity: Standard M10-M20, High Tensile M10-M16.