The AccuSharp DELUXE Tri-Stone Knife Sharpening System features a course diamond-coated steel that 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 deluxe 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 deluxe 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.