This new improved 12V portable chainsaw sharpener keeps your cutting chain performing like new. Includes three sharpening stones 5/32, 3/16, and 7/32. Sharpens 1/4, .325, 3/8 and .404 pitch chains. All you need to sharpen a saw Easy to use powerful motor, runs on any 12 volt auto type battery. Now comes with cigarette lighter connection plug. Complete instructions included.