A double-sided bench stone is not only more convenient to carry (one stone instead of two), but its money saver too! Theyll sharpen, hone and lap, all types of woodworking tools including knives, chisels, plane blades, gouges, and carbide router bits. Extra fine is 1200, fine is 600, coarse is 325 and extra course is 220 grit. Stones measure 8" x 2-5/8" and 10" x 4". Includes a non-skid mat to prevent slipping on work surface.