The Makita 18V LXT Lithium-Ion Brushless cordless Quick-Shift mode 3-speed impact driver (model XDT14Z, tool only) is a best-in-class fastening solution for users who want more torque, longer run-time, and precision fastening features. The XDT14Z delivers all of the above in a compact size with a superior power-to-weight ratio. The XDT14Z combines a full 1, 550 in. Lbs. Of fastening torque with category-leading precision features. Quick-shift mode is an automatic electronic controller that downshifts and reduces rotation and impact speed prior to driving the screw into place. It is engineered to minimize screw thread stripping, screw breakage and damage to work. For faster tightening of Self-Drilling screws, use the tightening mode (t-mode) and Avoid damage to the screw or work piece. These precision settings, combined with 3-speed power settings, give users more control for a wide range of fastening tasks ? from cabinet screws and deck screws to lag bolts, and much more. It is only 4-5/8" long and ideal for work in tight spaces.