The worlds first cordless grinder delivers the power of a corded grinder with upto 2X more runtime and upto 10X longer motor 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 upto 10X longer motor life and lower cost of ownership. The M18™ REDLITHIUM™ XC4 Battery pack delivers upto 4X more runtime and 20% more power. The grinder features REDLINK™ Plus™ intelligence, the most advanced system of cordless power tool electronics, for maximum performance. The 18 V 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. The grinder is built with the same tool body, gearing system and anti-vibration side-handle as Milwaukee® high performance corded grinders for maximum durability on the job. Grinding wheel sold separately.