Powerful DEWALT fan cooled motor delivers maximum power and durability. 6,500 rpm provides high power for cutting and grinding applications. Key less guard for enhanced application versatility. Convenient trigger switch with lock-off button for easier gripping. 2 Position anti vibration side handle offers greater comfort and control. Spindle lock allows users to change their wheels quick and easy. Metal gear case dissipates heat for longer bearing, gear and motor life. Exclusive Nano Phosphate Li-Ion battery pack provides 2000 charge cycles, more than double that of NiCd/NiMH packs. Battery pack produces 36 Volt power at equivalent weight to 18 Volt NiCd/NiMH pack weight.