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Use high-quality bore polishers from Grainger to clean, deburr and polish interiors of bores, cylinders, tubes, fittings and more. As flaps break down during use, a new layer of abrasive appears. Choose a bore polisher to remove rough edges and polish inner diameters measuring from 5/8" to 5-1/4" dia. Shop Grainger to find bore polishers ranging from 60 to 120 grit. Stock up today!