Coarse is blue, 45 micron/ 325 meshFAST: Hardest material, most efficient sharpening abrasive. Available in unique interrupted surface and continuous surface
4" Diamond Whetstone™ for use with Aligner™ AHF (Interchangeable Stone Holder). Available in Extra-Coarse, Coarse, Fine and Extra-Fine Diamond. X- Extra -Coarse (Black 60 micron/ 220 mesh); C-Coarse (Blue 45 micron/ 325 mesh); F-Fine (Red 25 micron / 600 mesh); E-Extra-Fine (Green 9 micron / 1200 mesh); Extra-Extra Fine (Tan - 3 micron / 8000 mesh).
EASY: Light pressure produces a sharp edge with just a few strokes
CLEAN: Use water for lubrication - no oil, smell or mess
VERSATILE: Hones ALL hard materials: carbide, steel, etc
DURABLE: Starts flat, stays flat. Provides years of consistent, reliable use
Made in USA
See 'Ships Direct from Manufacturer's link for warranty and return details.