Dont run to the hardware store every time you need the chain sharpened on your chain saw. A dull chainsaw wastes time and effort; not to mention what the safety hazard dull blades create. Save time and money by sharpening that chain yourself with the Electric Chain Saw Sharpener. It is easy to use when mounted to a bench, wall or vise, and it adjusts most popular chain designs. The 4-1/4 in.x 1/8 in.grinding wheel spins at 4200 RPM to get the teeth good and sharp. Just plug into a standard 120 volt wall outlet.