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.

Specification:

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.
Max. Fastening Torque: 280Nm.
Bolt Capacity: Standard M10-M20, High Tensile M10-M16.
Weight: 1.7kg.