General description The DMT DMT-W250FCNB Double Sided Diamond Whetstone is designed for sharpening a wide range of tools. The Red side is ideal for woodworking tools, carbide tooling, router bits, and kitchen knives, while the Blue side is suitable for general carpentry tools, tin snips, chisels, and more. These whetstones are ultra-precision, lightweight, and feature a rigid construction that ensures durability. Technical specifications Dimensions: 250mm Red side: Fine Grade 600, 25 micron Blue side: Coarse Grade 325, 45 micron Black side: Extra Coarse Grade 220, 60 micron Green side: Extra Fine Grade 1200, 9 micron Usage Use water for lubrication; no oil, smell, or mess. Can hone all hard materials including carbide and steel.