Impact Driver, Drive Size 1/4 in Hex, Drive Configuration Straight, Max. Torque 2,000 in-lb, Voltage 18V DC, Brushless Motor Yes, Free Speed 3600 RPM, Impact Rated Yes, Impacts per Minute 4300, Number of Speed Settings 4, Collett 1/4 in Hex, Cordless Tool Kit Contents (1) Bare Tool, (3) Batteries, (1) Charger, Number of Batteries Included 3, Battery Capacity (3) 5.0 Ah, Battery Model No. 23Y581, Battery Series M18 Redlithium, Charger Included Yes, Charger Model 23Y581, Case Included Yes