Outstanding Design: This is a well-designed pencil sharpener. Not only is it compact and easy to transport, it is quick to install and simple to use. It will not make sharpening the chainsaw any less tedious, but will ensure precise execution.Simple to use: it is as simple to use as a pencil sharpener; Simply place the jig on the bar, position the wheel against a tooth, insert the burr through the guide bushing, and crank the handle.Precision Maintenance: for sharpen the next tooth, pull the chain forward and repeat the process. As you advance from one tooth to the next, the ratchet acts as a stop to ensure precise, repeatable positioning.Perfect choice: standard front angle sharpened to 30, anodized aluminum attachment with a removable crank and guide bushing set. Can be used for all chainsaws. Sold by the Bianco FR store