Four stones, 12 sides hundreds of ways to make your life sharper. Each high-alumina ceramic stone's triangular shape lets you hone plain edges on the flat sides and serrated edges with the corners. Includes two medium-girt stones and a pair of fine-grit stones. A channel running the length of each stone sharpens pointed objects like fishhooks. Keyed slots for three pre-set sharpening angles: 30° (15° each side) and 40° (20° each side) for knives, and 12-1/2° for scissors. Use two stones side-by-side like a classic benchstone on large knives. Its lid snaps halfway over the base to form a handhold. Use it dry; requires no oils or lube. Autoclave safe. Includes instructional book and DVD. Made in USA. Available: Medium Fine.