The AccuSharp Deluxe TriStone Knife Sharpening System featuring a course diamondcoated steel allowing you to easily sharpen and hone any straightedge blade with ease. AccuSharps three stone surfaces include coarse diamond medium aluminaoxide and fine ceramic. This TriStone System provides extra durability and safety on any surface with a rubbergrip base which prevents sliding while sharpening and honing your knives. Additionally the deluxe TriStone Sharpener base can be mounted to most countertops for extra stability. Includes an angle guide to assist in maintaining a consistent angle while sharpening. Grits Diamond Coarse 320 Synthetic Medium 280 Ceramic Fine 1500.