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1pc 3 inch Aluminum base Backer pad for diamond polishing pads. Diameter 3 inch, Aluminum based, M14 Thread. Backer for diamond polishing pads, sanding disc, and some other nylon-backed grinding discs. Aluminum body provide longer working life and can bear heavy duty working as steel body but lighter weight Convenient and very easy to use., Manufacturer: SHANGHAI DIATOOL CO., LTD.