DEWALT DC936VA 14.4-Volt XRP Hammer Drill/Driver with Vehicle Charger DEWALT-built high torque, high efficiency motor delivers maximum performance in all drilling and fastening applications XRP extended run-time batteries provide long run-time and battery life 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 torque Superior ergonomics optimize balance, size, and weight;