The 20-Volt MAX XR Angle Grinder features a brake, E-Clutch System and Kickback Brake. The brake quickly brings the wheel to a stop in 2-seconds or less when the trigger is released. The E-Clutch System automatically shuts down the motor when a wheel pinch in detected. These 2 features working together to shut the tool down without user interaction, called the Kickback Brake. Additionally, the grinder features a One-Touch Guard, which allows for single-action adjustments to change guard position. Keep your DEWALT 20-Volt tools running longer with the 20-Volt MAX Lithium-Ion Premium Battery Pack (DCB205). This battery is compatible with the complete line of DEWALT 20-Volt MAX tools. This battery is backed by a DEWALT 90-day money-back guarantee and 3-year free service contract for added peace of mind.