POWERSTATE™ Brushless Motor: Purposely built for the M18 FUEL™ 4-1/2" / 5" Angle Grinder delivers 8,500 RPM to provide the power to complete the toughest grinding and cutting applications. REDLINK PLUS Intelligence: Most advanced system of electronics in the industry, enabling communication between batteries and tools, allowing for unmatched levels of performance, protection, and compatibility. REDLITHIUM HIGH OUTPUT Battery Pack (Not Included): Provides 50% more power and runs 50% cooler versus standard REDLITHIUM Battery. Superior pack construction, electronics and performance deliver more work per charge and more work over pack lifespan than any battery on the market. RAPIDSTOP™ Brake stops most wheels in less than 2 seconds. Electronic Clutch for Kickback Protection Paddle Switch Design for Increased Comfort and Ease-Of-Use when Operating in Various Positions Overload Protection to Maximize Motor Life Tool-Free Guard Adjustment for faster guard installations and adjustments Anti-Vibration Side Handle for Increased User Comfort and Safety Tool-Free Accessory Change with Integrated FIXTEC Technology 5/8"-11 Spindle for Use with Common Grinding Accessories Compatible with all M18 batteries