The 40V max XGT Brushless Cordless 4-Speed Impact Driver (GDT01D) breaks new ground for the most demanding driving applications in wood, masonry and metal. It is powered by a Makita-built brushless motor that delivers 1,950 in.lbs. of Max Torque, outpowering other impact drivers in heavy-load applications. An ultra-smooth variable speed trigger provides optimum control and a one-touch 4-speed power selector button under the chuck allows users to adjust speed easily. Users get up to 50% faster speed with 4 speed settings (0-1,100/ 0-2,100/ 0-3,200/ 0-3,700 RPM and 0-1,100/ 0-2,600/ 0-3,600/ 0-4,400 IPM), when compared to Makita's 18V LXT Brushless Cordless 4-Speed Impact Driver (XDT16). The GDT01D offers 9 modes for a wide variety of applications, including two tightening modes, one assist mode, three forward and three reverse auto-stop modes. The two Tightening Modes (T-mode) provide faster tightening of self-drilling screws in thick or thin gauge metal, which helps prevent damage to the screw or workpiece. Assist Mode (A-mode) feature helps eliminate "screw cam-out" and "cross threading" by driving at low speed until tightening begins. Three forward and three reverse Auto-Stop Modes provide increased efficiency. This impact driver is a workhorse tool engineered to outlast with Extreme Protection Technology (XPT) to provide increased dust and water resistance in harsh jobsite conditions. Reinforced gear housing provides additional durability on the job site.