Trend DWS/CP8/FC 8-Inch Double-Sided Professional Diamond Bench Stone with Clearance Channels, Fine/Coarse Unique clearance channels produce faster, cleaner cut Industrial precision flatness of +/-0.0005-Inch offers ability to sharpen spindle knives Ideal for flattening chisels and planer blades as well as achieving a shaving edge on your tools in seconds Diamond grades are marked on stone Comes complete with pouch, cleaning block and non slip mat