DEWALT DCD959KX 18-Volt 1/2-Inch XRP Hammerdrill/Drill/Driver XRP extended run-time batteries provide long run-time and battery life Patented 3-speed all-metal transmission matches the tool to task application for fastest application speed Heavy-duty 1/2-inch self-tightening chuck tightens throughout operation providing superior bit gripping strength High power, high efficiency motor delivers 420 unit watts out of max power for superior performance in all drilling and fastening applications Heavy Duty 1/2-Inch Self Tightening Chuck