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Steel shank, aluminum coupling.. Cotton bore mops 20 cal cotton bore mop, 3 pak 2 7⁄8" (7.3cm) long, 8 32 thread. Great for applying Brownells Moly Bore Paste orJ B Compound. Cotton fibers really soak up cleaning solvents and oil. 3¼" (8.3cm) long, 5 40 thread. The natural scrubbing action of cotton helps remove loosened powder fouling.
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