Disc Size: 2 inch Roll Lock Flap Disc Type R Thread in 45 Assorted Conditioning Disc (Fine/Medium/Coarse 15 ea) Material: Open Weave Nylon Impregnated with Abrasive Grains Fine (blue) , Medium (red), Coarse (brown) Deburring and surface prep, gasket removal, coating removal, cleaning wed splatter, removing heat discoloration, blending and finishing , etc Suitable for Stainless steel, standard or alloyed steel, non-ferrous materials and alloys, plastic and fiberglass Max operating speed: 25,000RPM