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As Seen On Shark Tank

Black-Phosphate Steel Thread-Locking Insert, Easy-to-Install, 5/16"-24 Thread Size, 1/2"-13 Tap Size (Packs of 10)

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Black-Phosphate Steel Thread-Locking Insert, Easy-to-Install, 5/16"-24 Thread Size, 1/2"-13 Tap Size (Packs of 10)