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Standard Abrasives Quick Change A/O 2 Ply Disc 522408 P120 TSM Brown 2" Die QS200PM. Choose a Standard Abrasives Quick Change Aluminum Oxide 2-Ply Disc to swiftly grind, deburr, and blend workpieces for maintenance repair operations (MRO) on ferrous metals and composites. The 2-ply backing provides added stiffness and disc life for low to medium-pressure applications while yielding to accommodate both flat and contoured surfaces.