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