TREND DWSCCFC DOUBLE SIDED DIAMOND STONE WHETSTONE A precision doublesided credit card size diamond stone Fine 600 grit 25 micron Coarse 300 grit 50 micron Complete with black storage wallet Guaranteed for five years Ideal for fluted shaped & small router bits carbide or HSS turning tools chisels plane blades carving tools & all general tooling Plate thickness 18mm for extra stability Grit sizes clearly marked on each surface