These are such a must when you are out working and need to quickly re-sharpen you chain to get back cutting again. This tool takes the struggle out of sharpening a chainsaw chain by holding the chainsaw cutting bar and saw rigid in one place while you work the chain. All you do is simply hammer the vice's prongs into a nearby log and then clamp the chainsaw bar between the locking bolt which provides not only stability but more safety for the person sharpening. Suitable for all Stihl, Husqvarna, Homelite, Ryobi, McCulloch, Jonsered, Partner, Zenoah, Echo, Kioritz, Efco, Emak, John Deere, Oleo Mac, Olympyk, Alpina, Shindaiwa, Einhell, Poulan and Tanaka Chainsaw models.