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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. 43.166 steel mandrel. They are ideal for cleaning and polishing grooves, ball corners, flares, angles and other hard to reach surfaces as well as for use on molds, dies, castings, combustion chambers and ports, stainless steel tanks, shafts, turbine blades, and many others.