Makita XWT08Z  LXT Lithium-Ion Brushless Cordless High Torque Square Drive Impact Wrench, 18V/1/2" BL Motor delivers 740 ft.lbs. of Max Torque and 1,180 ft.lbs of breakaway torque 3-speed power selection switch (0-900/0-1,000/0-1,800 RPM & 0-1,800/0-2,000/0-2,200 IPM) provides precise fastening control 1/2" anvil with friction ring for quick and easy socket changes The BL Brushless Motor eliminates carbon brushes, enabling the BL Motor to run cooler and more efficiently for longer life Efficient BL Brushless motor is electronically controlled to optimize battery energy use for up to 50% longer run time per charge