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adapter connector M22 Diamond Core Drill Machine Convert to 1/2-20 UNF Chuck Range 3-16mm/2-13mm/1.5-13mm/5-20mm Hand Drill - AliExpress
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Amazon.com: Drill Chuck Arbor R8 Shank to 1/2in Threaded 20mm Length Manganese Steel Mill Arbor Adapter : Industrial & Scientific
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