4" overall. Rubber handle. Grit: Coarse Fine. Surface contains multiple layers of micron-sized moncrystalline diamonds and a unique sharpening surface with an overlapping oval hole design.æThis innovation speeds sharpening by collecting and holding the metal filings which ordinarily build up during the sharpening process. Each stone has a "micro-tool sharpening pad" and a sharpening groove for fish hooks or pointed tools. Stones store inside handle