Dremel Chainsaw Sharpening Bit Set (3-Pack 1/4 in, 3/8 in, 0.325 in) 458 - The Home Depot
Sanding Bits for Dremel Rotary Tool, Grinding Stone Sanding Drill Bits with 1/8" Shank, Aluminium Oxide Tough Enough to Metal Rust Removal/Smoothing/ Sharpening, Different Shape Meet More Needs, 42Pcs - Amazon.com
Dremel 453-03 5/32" Textured Steel Grinding and Sharpening Stone Bits Rotary Accessory, 2 Pack - Yahoo Shopping