Cordless Impact Wrench Kits, Impact Wrench, Drive Size 1/2 in Square, Drive Configuration Straight, Max. Torque 330 ft-lb, Battery Included, Voltage 20V DC, Series MAX, Cordless Tool Battery Type Li-Ion, Brushless Motor Yes, Anvil Impact Action Mechanical, Max. Blows per Minute 1500, Max. No Load RPM 1000, Cordless, Handle Type Pistol Grip, Battery Capacity (2) 5.0Ah, Tool Length 7 In., Tool Weight 3.5 lb, Clutch Style Detent Pin Anvil, Battery Included (2)31AC52, Battery Pack Replacement 31AC52