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Looking for a fast and easy way to clean and polish older barrels, or put a mirror polish on new ones? Look no further than the Flex Hone® set, featuring hundreds of abrasive "balls" mounted on a flexible shaft. Start with the Medium-Coarse hone for used barrels, and finish with the Fine hone to remove rough spots and bring the bore to a bright, smooth finish. For new barrels, the Fine hone by itself will do the trick. To use, simply attach the hone to a variable speed electric drill, wet it with Flex Hone® oil, and insert it into the barrel from the breech end (if possible). As the hone cuts, a slurry of abrasive and oil develops to speed up the process. The Flex Hone® is available in sets and individual hones for 10, 12, 16, and 20 gauge barrels, as well as .410 bore. Special-sized hones are also available for 10, 12, 16, 20 gauge chambers, and .410 bore. Instructions are included for a perfect job every time. Important note: all other oils will destroy the abrasive "balls" and void the guarantee, so be sure to use Flex Hone® oil. Maximum speed is 750 RPM, and excess pressure should be avoided. Check out the PDF for more information.