The dewalt dcg412 125mm xr premium angle grinder has a powerful fan cooled motor and intelligent variable speed trigger and lock off switch for enhanced work safety and control it features the xr lithium ion technology and is part of the intelligent xr lithium ion series designed for efficiency and making applications faster the powerful and highly efficient pm58 dewalt fan cooled motor has replaceablebrushes and delivers up to 7000 rotations per minute for fast cutting and grinding applications