General description The Double Sided Diamond Whetstone 250mm Fine / Coarse is designed for versatile sharpening needs. The Red side is ideal for woodworking tools, carbide tooling, router bits, and kitchen knives, while the Blue side caters to general carpentry tools and various other implements. Technical specifications Dimensions: 250mm Red side: Fine 600g, 25 micron Blue side: Coarse 325g, 45 micron Usage Red side for sharpening woodworking tools, carbide tooling, router bits, and kitchen knives. Blue side for sharpening general carpentry tools, tin snips, wood flat bits, Stanley knives, masonry drills, chisels, garden tools, fish hooks, and darts.