Dewalt DC820B. Features: Frameless motor for extended tool durability and life. Compact size and weight allows access into tighter areas and reduces user fatigue. 1,740 in-lbs. (145 ft-lbs.) of torque to perform a wide range of fastening applications. 0 to 2,400 RPM and 0 to 27000 IPM for faster application speed. Replaceable brushes for increased serviceability. Textured anti-slip comfort grip provides maximum comfort. Durable magnesium gear case and all-metal transmission for extended durability. Heavy-duty impacting mechanism directs torque to fastener without kickback. XRP extended run-time batteries provide long run-time and battery life.