DMT AKFC Aligner Quick Edge Kit Superior Diamond Sharpening Stones Legendary quality Made in the USA Fabric storage pouch & easy to follow instructions Two different stones: Coarse diamond to transform a dull edge and Fine diamond for a razor sharp edge Sharpens knives faster than conventional stones with DMT's monocrystalline diamond surface No oil is needed-sharpen dry or with water Durable construction will provide years of consistent performance and reliable service