Achieve a finer, longer-lasting finish on gravers and tools, especially carbides, with the GRS Cast Iron Lap. Made from superior cast iron, this precision-ground lap offers tool polishing advantages that even the latest high-tech abrasive materials simply cannot match. Instantly notice the difference in too performance and life. Both lap sides are identically prepared, providing the sharpening life of two laps in one. For tool steel, high-speed steel, or hardened carbon steel, consider the GRS Ceramic Lap for the best performance.