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Grit Textures: Each Cratex size and shape is made in four standard grit textures or compositions which differ in accordance with the mesh size of the abrasive grain used. Coarse (Green) Medium (Dark Brown) Fine (Reddish Brown) and Extra Fine (Grey Green).For use with light pressure at much less than 20,000 RPM maximum safe speed. Use with No. 43124 or 43154 steel mandrel. Cratex Shaped points are made in both cylinder and bullet shapes...for smoothing and polishing hard to reach surfaces...grooves, ball corners, holes, clasps, spirals, flutes, and edges. They are widely used for polishing molds, dies, patterns and light castings; for cleaning contact points, solder spots and for relieving stress, micro-deburring, and damaskeening.