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" / 5" 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.