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The Makita 18V LXT 4-Speed Impact Driver (XDT20) sets new standards by offering 4-speed power selections which provides precise fastening control for a wide range of applications. The tool also includes reverse rotation auto-stop mode which stops rotation and impact when the fastener is loosened adequately to help prevent over-loosening and dropped fasteners. In addition, the 4-speed impact driver offers 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.