The Makita 18V LXT Lithium-Ion Brushless cordless high torque 7/16" hex chuck impact wrench (XWT09XVZ, tool only, batteries and charger sold separately) combines 590 . Fastening torque with extended run time and speed control for unmatched fastening performance. It features an efficient Makita Brushless motor for longer run time, increased power and speed, and longer tool life. The electronic 3-speed power selection switch gives users more precise fastening control. With the 7/16” hex chuck and hanging ring, it is ideal for linemen and electricians for installation and maintenance of power lines, wood boring, and more. It's part of Makita's expanding 18V Lithium-Ion system, the world's largest cordless tool system powered by 18V Lithium-Ion slide-style batteries. Makita 18V Lithium-Ion batteries have the fastest charge times in their categories, so they spend more time working and less time sitting on the charger. For improved tool performance and extended battery life, Makita created Star protection Computer controls . Star protection is communication technology that allows the Star Protection-equipped tool and battery to exchange data in real time and monitor conditions during use to protect against overloading, over-discharging and overheating. For increased versatility, the tool can also be powered by Makita 18V LXT and compact Lithium-Ion batteries with the Star symbol on the battery indicating Star protection inside.