DOUBLE-SIDED DESIGN: One stone for both sharpening and restoring with an Extra Coarse 180 Grit (70 micron) side and a Coarse 300 Grit (50 micron) side for sharpening your tool edges. CONVENIENT SIZE: Keep this compact credit-card sharpening stone in your wallet for on-the-go use in the workshop, garden, woods, home or job site. Comes complete with storage wallet. MULTIPURPOSE SHARPENER: Ideal for roughing gouges, HSS hollowing inserts, HSS coring inserts, scrapers and repairing damaged edges. Creates durable edges on your tools in seconds. EASY TO USE: Simply apply gentle pressure to achieve a professionally sharp edge. We recommend using with Trend Lapping Fluid (sold separately) to prevent clogging or rusting. NO NEED FOR MULTIPLE GRADES: Both sides use monocrystalline diamonds for fast, clean, stock removal and the double-sided design eliminates the need for multiple sharpening stones.