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Amazon.com: Ficero Thread Protector, 1/2 x 28 Convert to 5/8x24 with Crush Washer Steel (2 Pack) : Industrial & Scientific
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DB TAC Thread Adapter Convert 1/2''x28 TPI Thread to 5/8''x24 TPI Thread 1/2 ''-28 TPI Thread To 5/8''-24 TPI Thread Black Color Steel - DB TAC
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