5/16-18 Internal, 1/2-13 External, Unc,
$4.58
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Go to the shop5/16-18 Internal, 1/2-13 External, Unc, 11mm Insert Length, Heavy Duty Keylocking Thread Insertscarbon Steel, Zinc Phosphate Finish, Grade C1215, 2b Internal Class Of Fit, 2a External Class Of Fit, Use Tool 215-064703.