best non standard drill bit

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Drill collars 2-7/8" to 14" connection threads: nc26, nc31, nc38, nc40, nc46, nc50, 5 1/2fh.6 5/8fh. internal upset: iu, eu, ieu heavy weight drill pipe is a medium-weight drilling pipe, (referred standards in api spec 7-1). it has bigger wall thickness than common drilling pipe and smaller than drill collar.

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best non standard drill bit exporter from China, we are essentially the most specialist supplier from USA with ISO9001 Certification. Also the merchandise happen to be certified by mutiple safety certification.We'll offer you our best non standard drill bit priducts in top-quality and most favourable value.


Our company primarily engaged and export best non standard drill bit. we depend on strong technical force and continuously develop sophisticated technology to meet the demand of best non standard drill bit prospects. We're sincerely welcome mates from a variety of circles at household and abroad come to cooperate!

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