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Indispensable in every workshop! This thread gauge is used to determine the bolt diameter of US bolts from #4 to 1" and metric bolts from M3 to M22. Identifies US nuts from #6 up to 5/8". Includes a 3-D thread checker that determines the thread pitch of US bolts from 2.5 to 40 turns and metric bolts from 0.70 to 2.5 turns.
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