Norton Combination Grit Abrasive Benchstone, Silicon Carbide, 6" Length x 2" Width x 1" Height 100 grit on one face for repairing cutting edges & 280 grit on the opposite face for sharpening & maintaining Prefilled with oil to save time and eliminate the need to presoak it prior to use. Restore cutting edges on small straight-edged tools such as chisels, knives, plane blades, and precision instruments. 1"H x 6"W x 2"D Conforms to the American National Standards Institute (ANSI) abrasive grit standards.