GRS Ceramic Lap, 6-inch / 150 mm 002-415 for PowerHone After sharpening with GRS Diamond Wheels, get the perfect polish for finishing tools with the 6″ / 150 mm Ceramic Lap. A mirror finish is a must for Western bright cuts, engraving for jewelry, and sparkling hand-engraved letters. For use with most gravers and tools. Requires Diamond Spray for best performance. 1/2 Micron Diamond Spray (#002-753) recommended. Size: 6″ / 150 mm.