18 Pc. Set Chain Saw Grinding Sharpening Stone Deburring Dremel Proxxon Rotary Tools 18 Pc. Sharpening Stone Set - Cylindrical 6 pcs 5/32", 6 pcs 7/32", 6 pcs 5/16" Shank diameter is 1/8" Precision ground abrasive stone for quick, easy sharpening of chain saw blades Made in Taiwan