DEWALT DC810KL 28-Volt Lithium Ion 1/2-inch High Performance Impact Wrench Kit with NANO Technology Heavy-duty impact mechanism directs torque to fastener without kickback Heavy-duty all-metal anvil provides durability and prevents shearing High speed all-metal transmission delivers 2,400 rpm for increased productivity DEWALT-built high torque, high efficiency motor delivers maximum performance in all drilling and fastening applications DEWALT exclusive lithium-ion cells offer long battery life and durability: 2,000 recharges Variable speed reversible switch avoids air bubbles when mixing mud and offers greater control when drilling