Precision ground abrasive stone for quick, easy sharpening of chain saw blades. Features: * Ideal for sharpening chain saw blades, quickly and easily * Keep a light touch; too much pressure can break the grinding stone. * For best results, insert the accessory bit all the way into the tool and then back it out slightly before tightening down. This provides plenty of shank for the collet or chuck to hold onto the bit * Shank diameter: 1/8-inch What"s In The Box: * Dremel 453 5/32-Inch Chain Saw Sharpening Stone