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Check the listing for details. 76Pcs Thread Checker, Upgrade Nut and Bolt Thread Checker 34 Standard and 26. Condition: New. Listed at 113.75 USD. To solve your confusion about size guesses, this thread gauge tool is your best choice. The thread gauge is manufactured by CNC machining to ensure that the accuracy complies with Go & No-Go Class 2B ANSI Standard.