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40/60/80/120 Grit assorted pack, each grit 5pcs, 4-1/2 Inch Diameter, 7/8 Inch Arbor, Type #27, 13300RPM maximum speed Premium resin-bonded aluminum oxide abrasive produces high performance: durable, good abrasion resistance, anti-static and anti-clogging Fiberglass backing providing durability and reinforcement