From dull to sharp in as little as 3 seconds * PowerSharp 2-piece starter kit for 16-inch chain on Stihl saws * Starter kit includes PowerSharp chain, PowerSharp bar, sharpening stone, and bar-mount sharpener * Contains PowerSharp 539456 bar and PowerSharp PS55 chain * For 3/8-inch pitch low profile chain and .050-inch gauge cutting systems