Hitachi G18DL 18-Volt 4-1/2-Inch Lithium Ion Disc Grinder  (Discontinued by Manufacturer) Lightweight (4.2 lbs) and compact design for maneuverability, especially in overhead applications High torque motor with no-load speed of 9,100 RPM to power through tough cutting and grinding applications Slide switch with quick off feature to immediately shut tool down for added safety Spindle lock for quick and easy wheel changes Tool body compatible with all HitachiLithium Ion, NiCd and NiMH 18V batteries