4-1/2", X-Lock, Angle Grinder With X-Lock Wheel Change, X-Lock Mount Offers A Reliable Wheel Change Interface, Up To 5X Faster Than Conventional Interfaces, Pull Of A Lever To Release Wheels, Ergonomic Slim Grip Zone, Powerful Motor 10A & 11,000 RPM, Epoxy Coated Field Windings Extend Motor Lifetime & Preventing Dust & Debris, Service Minder Brushess Eliminates Guesswork, Stopping Grinder When Preventative Maintenance Is Required, Includes Auxiliary Handle & Wheel Guard.