Katzco 4 Piece Diamond Industrial Chainsaw Sharpener File Tool Set with Guide Attachment - for Rotary Tools, Die Grinders, Drills, Chainsaw Chains, Sharpening, Collet Wrench EXTEND THE LIFE OF YOUR CHAINSAW - Extend the life of your chainsaw by years! With the multiple grit diamond burrs you can make sure that your chainsaw blade never goes dull on you ever again. CUT FASTER WITH YOUR CHAINSAW- Katzcos chainsaw sharpener allows you make your chainsaw blade as sharp as possible so that it never goes dull and so your chainsaw always cuts quickly and efficiently with ease. FAST AND EASY USE- These chainsaw chain sharpeners are super fast and easy to use. the shank of the sharpeners allows them to fit on virtually any mandrel or rotary tool you have laying around. Just screw onto rotary tool and start filing away. VALUE PACK- These chainsaw chain sharpeners come in a pack of 4 different sized sharpening burrs. Following burr cylinder sizes are: 3/16, 5/32, 11/64, 7/32 wide. Get the best bang for your buck by getting 4 for the price of 2. DIY- These chainsaw chain sharpeners allow you do all the work yourself with the littlest amount of risk involved. Why take your dull chains to get repaired when you can put life into them yourself.