Features A Professional Range precision double-sided credit card diamond stone. Coarse 300 grit (50 micron) and ex-coarse 180 grit (70 micron). Ideal for roughing gouges, HSS hollowing inserts, HSS coring inserts, scrapers and repairing damaged edges. A precision double sided credit card size diamond stone. Creates durable edges on roughing gouges in seconds. Will give a tough lasting burr on a scraper. Re-shoulder and sharpen pocket knives, and flattens chisel backs. Thick body thickness 1.6mm for extra stability. Complete with storage wallet. Guaranteed for five years when used with Trend Lapping Fluid. Grit sizes clearly marked on each surface. Specification Size: 84 mm x 50 mm x 1.6 mm Grade: Corse & Ex Coarse Grit: 300 & 180 (nom. 50 & 70 micron) Standard Equipment 1x Trend DWS/CC/CX Credit Card Double-Sided Diamond Stone