DEWALT DC800KL 36-Volt 1/2-inch Lithium Ion Cordless Impact Wrench Kit with NANO Technology DEWALT-built high torque, high efficiency motor with replaceable brushes delivers maximum performance in all fastening applications DEWALT exclusive lithium-ion cells offer long battery life; durability: 2,000 recharges Preferred rocker switch design for fast and easy forward and reverse Patented all-metal anvil provides durability and prevents shearing Anti-slip comfort grip provides increased comfort and control; High speed all-metal transmission delivers 1,400 rpm for increased productivity