DEWALT 18V Impact Wrench offers maximum torque to perform a wide range of heavy-duty fastening applications. Features rocker switch design for fast and easy fastening, along with a comfort grip for maximum comfort. Durable magnesium gear case and all-metal transmission for extended durability. Heavy-duty impacting mechanism directs torque to fastener without kickback. Cordless: Yes, Max. Torque (ft.-lbs.): 300, Impacts Per Minute (IPM): 2,600, Drive (in.): 1/2, Speed - No Load (RPM): 1,650, Reversible: Yes, Volts: 18, Battery Included: Yes, (2) 18V XRP™ batteries, Charger Included: Yes, 1-hr. charger, Case Included: Yes, Tool Length (in.): 10 3/4, Tool Weight (lbs.): 7.55 Drive: Square with detent pin retention
The main difference between the DC820 and the DWO59K-2 is the torque rating. The DC820 has a max of 145 ft-lbs, while the DWO59K-2 has a max torque rating of 300 ft-lbs, which means the DWO59K-2 is a heavier duty tool.