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9 Micron / 1200 Grit , 3M Imperial Lapping Film (Blue), Premium precision abrasive for super-fine, super-consistent finishes. High strength 3mm polyester film backing coated with aluminum micron-graded mineral particles provides greater finishing efficiency. Used in polishing process on precious metals like jewelry,lapidary,watch and clocks, as well as cutting tools such as gravers and knives. Measures 8-1/2" x 11".
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