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Amazon.com: Burkit 3/8"-20 UN Tap and Die Set, 3/8 x 20 UN Machine Thread Tap and Round Die Right Hand : Industrial & Scientific
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Value Collection - Tap & Die Set: #4-40 to 3/4-16 Taps, Metric Coarse, Metric Fine, NPT, UNC & UNF - 03959137 - MSC Industrial Supply
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