The world's first cordless braking grinder stops accessories in under 2 seconds, delivers the power of a corded grinder, and has up to 10X longer tool life. The M18 FUEL 4-1/2 in. / 5 in. grinder supplies maximum sustained power to complete the toughest grinding, surface preparation and cutting applications. The POWERSTATE brushless motor provides up to 10X longer motor life and lower cost of ownership. The M18 REDLITHIUM XC5.0 battery pack delivers up to 4X more run time and 20% more power. The grinder features REDLINK Plus intelligence, the most advanced system of cordless power tool electronics, for maximum performance. A rapid stop brake feature stops accessories in under 2 seconds. The 18 Volt lithium-ion grinders thin body design gives it optimized balance to rest easily in your hands. Tool-free accessory changes using the FIXTEC nut and guard adjustments mean less downtime during work. The grinder is built with the same tool body, gearing system and anti-vibration side handle as Milwaukee's legendary high-performance corded grinders for maximum durability on the job. Grinding wheel sold separately.