4-1/2"-6" Grinder with Kickback Brake delivers 13 Amp motor equivalent power with a no-load speed of 9000 rpm to deliver ultimate power. Kickback Brake engages when a pinch, stall, or bind-up event is sensed. The electronic brake engages with maximum force to quickly stop the wheel, reduce the movement of the grinder, and shut the grinder off. E-Clutch activates in less than a tenth of a second when a pinch/stall is detected, shutting down the motor. 9,000 RPM Speed allows the use of up to 6" wheels. Kit includes: Grinder, (2) FLEXVOLT™ 9.0Ah Lithium Ion Batteries, charger, side handle, 4-1/2" type 27 wheel, 4-1/2” type 27 guard, 6" (150mm) type 27 guard, wrench, flanges, and kitbag.