This combination coarse / fine grit India bench stone produces keen, long-lasting edges with its unique combination of coarse & fine grit aluminum oxide abrasive. To improve sharpening & reduce clogging, use with oil. Ideal for clean deburring, these benchstones will produce sharp edges & quality finishes. 4" length  x  1-3/4" width  x  5/8" thickness. Oilstone made by Norton, Saint Gobain. Model IB134.