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1/2″-20 TPI (female) to 5/8″-24 TPI (male) Thread Converter-Blued Steel-CZ – SKU#126 – Hughes Precision LLC
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Weldon Shank Adapter JESTUOUS 3/4 Inch Weldon Shank to 1/2 Inch-20UNF Threaded Shank for Drill Chucks Hand Drill Press - Amazon.com
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