The HART 20V 4-1/2-inch Angle Grinder is equipped with a high-performance motor delivering up to 6 .500 RPM for applications including sharpening mower blades . removing excess rust from metal surfaces and much more. The 3-position auxiliary handle provides added comfort and control for use while ensuring you’ve got a secure grip. The spindle lock ensures quick and easy wheel changes to get you through your projects as quickly and safely as possible. For added safety . this grinder features a two-finger trigger to activate the tool ensuring only deliberate activation. The HART 20V Grinder operates on any 20V HART Lithium-ion battery allowing you to expand your tool collection.