Features and Benefits:POWERSTATE™ Brushless Motor: Purposely built for the M18 FUEL™ 4-1/2" / 5" Braking Grinder with ONE-KEY™ 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.;Includes a RAPIDSTOP™ Brake, to quickly stop accessories and Enhance Safety;Slide Switch Designed to Reduce User Fatigue;Tool-Free Guard Adjustment for faster guard installations and adjustments;Tool-Free Accessory Changes with Integrated FIXTEC Nut Technology;Electronic Clutch for Kickback Protection;5/8"-11 Spindle for Use with Common Grinding Accessories;Overload Protection: Maximizes motor life;The MILWAUKEE® M18 FUEL™ 4-1/2" / 5" Braking Grinder with ONE-KEY™ Slide Switch, Lock-On is the next advancement in power and performance of cordless grinders while enhancing safety with its RAPIDSTOP™ Brake. The M18 FUEL™ 4-1/2" / 5" Braking Grinder with ONE-KEY™ generates 11A corded power to complete the toughest grinding and cutting applications. The POWERSTATE™ Brushless Motor delivers maximum sustained power and 8,500 RPM to remove material faster and increase productivity. REDLINK PLUS™ Intelligence ensures unmatched levels of performance, protection, and compatibility. The RAPIDSTOP™ Brake provides stop times under 2 seconds with an abrasive disc. This battery-powered grinder includes an electronic clutch for kickback protection, as well as overload protection to maximize motor life. Compatible with ONE-KEY™, this grinder wirelessly connects to a smartphone to track and manage the tool, providing visibility to where tools are across a network of jobs. The M18™ REDLITHIUM™ HIGH OUTPUT™ XC6.0 Batteries (not included) deliver 50% more power while running 50% cooler than the M18™ REDLITHIUM™ XC Batteries. Experience faster accessory changes, and less downtime with tool-free accessory and guard adjustments, while remaining fully compatible with the most common accessories in the market. The M18 FUEL™ 4-1/2" / 5" Braking Grinder with ONE-KEY™ is the next level of jobsite productivity and enhanced safety in cordless grinders.