Cordless hammer drill as powerful as corded now made affordable high performance: As fast as corded same impact energy, same drilling capacity ,interchangeable carbon brush gives high serviceability. Easy and precise control of the rpm thanks to variable speed protection of the user and the machine in case of overload or binding no abrupt blockage of the tool by unlatching clutch dogs and minimizing torque dust extraction : Directly into the integral dust bag on the tool and/or using an all-purpose dust extractor system : Fast, tool-free changing of application tools.