The Bosch GWS18V-10P 18V Brushless 4-1/2 – 5 In. Angle Grinder is an ergonomic, robust grinder that is engineered with a narrow grip zone for best user comfort and considerable power. It delivers the ultimate combination of performance, control, and power in a cordless grinder. The grinder's brushless motor provides performance comparable to a 10-amp corded grinder and greater efficiency that maximizes runtime and productivity. The grinder has a brake system, which helps provide a rapid stop of the wheel when the switch is turned off. It also includes other advanced electronics such as KickBack Control, restart protection, and constant electronics for constant speed under load. The grinder features a multi-grip paddle switch, which provides increased grip options for better comfort and control and a gearhead mounting collar that's compatible with all Bosch grinder guards.