Heavy-Duty XRP™ 1/2 in 13mm 14 4V Cordless Hammerdrill/Drill/Driver Kit Product Features DEWALT built high power high efficiency motor delivers maximum performance in all drilling and fastening applications XRP™ extended run-time batteries provide long run-time amp battery life Patented 3-speed all-metal transmission matches the speed to the application for optimal performance Heavy-duty 1/2 in self-tightening chuck tightens throughout operation providing superior bit gripping torque Superior er