Makita XDT19LXT 4-speed Impact Driver Tool Only Li-ion 18V Brushless Cordless. The Impact Driver features Assist Mode (A-mode) which helps eliminate “screw cam-out” and “cross threading” by driving at low speed until tightening begins. It also features two Tightening Modes (T-mode) for faster tightening of self-drilling screws in thick or thin gauge metal that helps prevent damage to the screw or workpiece. The XDT19 delivers industry-leading performance in a compact and ergonomic design. Added features include the one-touch 4-speed power selector button under the chuck, which enables one-handed speed changes, and reverse rotation auto-stop mode which stops rotation and impact when the fastener is loosened adequately to help prevent over-loosening and dropped fasteners. Quick-Shift ModeT uses the brushless motor’s electronic controls to find the best balance of speed and torque for each application for more efficient fastening. Makita-built brushless motor delivers 3,600 Max RPM and 1,590 in. 4-speed power selection (0-1,100/ 0-2,100/ 0-3,200/ 0-3,600 RPM & 0-1,100/ 0-2,600/ 0-3,600/ 0-3,800 IPM) provides precise fastening control for a wide range of applications. Additional one-touch 4-speed power selector button under the chuck for added convenience. Assist Mode (A-mode) feature helps eliminate “screw cam-out” and “cross threading” by driving at low speed until tightening begins. Two Tightening Modes (T-mode) for faster tightening of self-drilling screws in thick or thin gauge metal; helps prevent damage to the screw or workpiece. Reverse rotation auto-stop mode stops rotation and impact when fastener is loosened adequately. Designed with dual ball bearing chuck to reduce bit wobble and run out. Lights on both sides helps eliminate shadows and illuminate a larger area. Compact and ergonomic design at only 4-1/2 long.