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DEWALT built high power, high efficiency motor delivers 425 unit watts out of max power for superior performance in all drilling and fastening applications. Patented 3-speed all-metal transmission matches the speed to the application for optimal performance. Heavy-duty 1/2" self-tightening chuck tightens throughout operation providing superior bit gripping strength. Enhanced durability and reliability to withstand the job-site environment and the most demanding applications. Anti-slip comfort grip provides increased comfort and control.