Coarse and fine grit sharpening stones feature multiple layers of micron-sized mono crystalline diamonds and a unique sharpening surface with an overlapping hole design. This 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 fishhooks or tools. Soft grip rubber handle is designed to make sharpening safe and easy and when you are finished sharpening you can store your stones in the handle for safekeeping.