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By certification 
Ring Gage
1.77CLcoil ring Gauge inspects the external dimensions of manufactured thread inserts.
2.Gage are ring lapped to size and hand polished to provide superior accuracy and wear ability.
3.Gauge makers tolerance will be applied minus on the GO and plus on the NO GO.
4.The precision of thread insert is 6H, 5H.
Most Metric sizes in the stock.
