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Petroleum thread casing gauges
 

Thread gauges completely according to the API SPEC 5B standard, the instruction for use and match tightening value supplied with gauges. Anti-turing structure and stable probe connectin designed to avoid loose connection in the bad environment. Sub-zero treatment leads to gauges dimension stability and anti-deformation. The matched pair of plug and ring gauges packed in a wooden box for convenient use.

 
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