3M Roloc Bristle Disc Application area: safer, faster and cleaner than wire brushing. Excellent for removing old seals on oil pan, valve covers or the like. Green - Removing rust, sealing material, UBS etc. Yellow - Removing stone impact protection, lacquer etc. White - machining aluminum Processing instructions: Optimum number of revolutions 12,000 - 18,000 rpm, maximum rotation 25,000 rpm. Measurements �: 50 mm Degree of fineness: Coarse Colour: green