This kit features a powerful hammer drill with advanced features, two 18 V 4.0 Ah FatPack batteries and an 18 V fast charger. It features kickback control and a precision clutch. It is an integrated acceleration sensor that automatically shuts the tool down when a potentially dangerous rotational torque reaction occurs in a bind-up scenario. The precision clutch has 25+1 settings, for longer tool life and accurate fastener driving with reduced overtightening. The tool has an upgraded and durable all-metal chuck, and it delivers outstanding bit grip and torque transfer. The efficient EC Brushless motor delivers outstanding runtime and longer motor life. It produces up to 663 In.-Lbs. of torque, a no-load BPM of 0-31,500 and a no-load RPM of 0-2,100 RPM.KickBack Control – reduces the risk from sudden rotational torque reaction in a bind-up scenarioPrecision clutch with 25+1 settings – provides driving accuracy for reduced fastener damageUpgraded all-metal chuck – for more durability, along with first-rate bit retentionEC Brushless motor – efficient power that delivers 663 In.-Lbs. of torque and outstanding runtimeBrute Tough design – compact hammer drill that provides plenty of powerGreat impact-to-weight ratio – weighs just 5.5 Lbs.,(with 4.0Ah Battery) but delivers 0-31,500 BPMOutstanding control – variable drilling speeds for high-speed (0-2,100 RPM) and high torque (0-480 RPM)Fast charging – included BC1880 charger charges an 18 V 4.0 Ah battery to 80% in 25 minutes and to 100% in 35 minutesDurashield housing – can stand up to tough jobsite conditions