Diamond Combination Bench Stone T0831D uses efficient monocrystalline abrasive for quickly sharpening and honing all edge tools. It offers a two-grit combination of coarse(360grit)and fine (600grit) diamond sharpening stones. Coarse to transform a dull edge and fine for a razor sharp edge. The stone features a unique sharpening surface with an overlapping oval hole design that speeds sharpening by collecting and holding the metal chippings. This allows the sharpening surface to remain clean and clear. And the plastic base with non-slip feet makes the sharpening easily and safely.