Black-Phosphate Steel Thread-Locking Inserts, Easy-to-Install, 1/4"-20 Thread Size, 1/2"-13 Tap Size (Packs of 10)

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Black-Phosphate Steel Thread-Locking Inserts, Easy-to-Install, 1/4"-20 Thread Size, 1/2"-13 Tap Size (Packs of 10)