world's first cordless grinder delivers power of a corded grinder with up to 2x more run time and up to 10x longer motor life.Milwaukee m18 fuel 4-1/2in./5in. Grinder supplies maximum sustained power to complete toughest grinding, surface preparation, and cutting applications. Powerstate brushless motor provides up to 10x longer motor life and a lower cost of ownership. M18 redlithium xc5.0 battery pack delivers up to 4x more run time and 20% more power. Grinder features redlink plus intelligence, most advanced system of cordless power tool electronics, for maximum performance. 18-Volt lithium-ion grinder's thin body design gives it optimized balance to rest easily in your hands. Tool-free accessory changes and guard adjustments mean less downtime during work. Grinder is built with same tool body, gearing system, and anti-vibration side handle asMilwaukee's legendary high-performance corded grinders for maximum durability on job. Grinding wheel sold separately.