Don"t 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 Pro-Series 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-Inch x 1/8-Inch grinding wheel spins at 4200 RPM to get the teeth good and sharp. Just plug into a standard 120-volt wall outlet.