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Sizes shown are diameter, thickness, arbor hole size. 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). Diameters from 1-1/2" to 6". Best performance speed may be well below the maximum safe speed of 4,200 RPM. Cratex Large Wheels have found wide application for removing rust, heat marks, tarnish, excess solder, scratches, corrosion...blending in and polishing welded seams after rough grinding...polishing bearing surfaces and raceways...removing burrs and breaking edges...smoothing and polishing castings and punched or sheared pieces...wet sanding of gem castings...wet sanding of gem stones...trimming plastic articles...smoothing glass edges...cleaning before welding or soldering...and for countless other deburring, smoothing, and polishing operations.