DMT W250EF-WB 10-Inch DuoSharp Bench Stone - Extra-Fine/Fine With Base Bench stone base is easy to adjust to fit bench stone and any 6"x2" stone providing 2" knuckle clearance and convenient handle on underside for moving stone over large work piece. Precision flat two-diamond bench stone in fine and extra-fine diamond provides sharpening consistency 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