Versachem 13209 Metal Grinding Compound - 1.5 oz. High temperature grease for lapping, grinding, sharpening and polishing metal surfaces Contains sharp, graded and extremely hard grains of silicone carbide Helps in valve grinding operations on automotive, industrial and marine engines Can be used to sharpen the blades of reel-type hand and power lawnmowers Grit on fine = 220, grit on course = 120