The accusharp tri-stone knife sharpening system allows you to easily sharpen and hone any Straight-Edge blade with ease. Accusharp's three stone surfaces include coarse diamond, medium alumina-oxide, and fine ceramic. This tri-stone system provides extra durability and safety on any surface with a rubber-grip base which prevents sliding while sharpening and honing your knives. Additionally, the tri-stone sharpener base can be mounted to most countertops for extra stability. Also included is an angle guide to assist in maintaining a consistent angle while sharpening..