DEWALT DC901Kl 1/2-Inch 36-Volt Cordless Lithium-Ion Hammerdrill/Drill/Driver Kit DEWALT built high power, high efficiency motor delivers 750 unit watts out of max power for superior performance in all drilling and fastening applications DEWALT exclusive lithium-ion cells offer long battery life and durability: 2,000 recharges Patented 3-speed all-metal transmission matches the speed to the application for optimal performance heavy-duty 1/2-inch self-tightening chuck tightens throughout operation providing superior bit gripping strength Enhanced durability and reliability to withstand the jobsite environment and the most demanding applications; Anti-slip comfort grip provides increased comfort and control