The 18V LXT Cordless 3/8 inch / 1/4 inch Sq. Drive Ratchet (XRW01Z, tool only) is designed to loosen nuts and take the nut off the bolt. This ratchet features interchangeable 3/8-inch and 1/4-inch anvils for versatility. The powerful Makita-built motor delivers 35 ft. lbs. of Max Torque and has a variable speed (0-800 RPM) for various fastening applications. An electric brake provides increased productivity. Operator fatigue is reduced due to the lightweight, ergonomic design. The low-profile design provides improved handling in tight spaces and for overhead applications. A built-in L.E.D. light illuminates the work area. When the motor is not engaged, the ratchet can be used manually. It's part of Makita's expanding 18V LXT System, the worlds largest cordless tool system powered by 18V lithium-ion slide-style batteries. Makita 18V LXT Lithium-Ion Batteries have the fastest charge times in their categories, so they spend more time working and less time sitting on the charger. Makita created Star Protection Computer Controls to improve tool performance and extended battery life. Star Protection is a 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 Lithium-Ion Batteries with the star symbol on the battery indicating Star Protection inside.