A CraftPro Range double sided credit card size diamond stone. Monocrystalline diamonds for fast, clean, stock removal. Excellent sharpening performance. Double sided for coarse sharpening and fine honing. Coarse 360 grit (nom. 40 microns) and fine 600 grit (nom. 25 microns). Ideal for fluted, shaped & small router bits, carbide or HSS, turning tools, chisels, plane blades, carving tools & all general tooling. Recommended use with Trend lapping fluid to prevent clogging or rusting and assist in keeping tools clean.