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| Lifting subs are made of 4145H modified CrMo alloy steel. Its technical parameter meet API Spec-7 standard. All threads are hposphated, cooperized or cold worked. ... |
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| Non-magnetic heavy weight drill pipe is made of low carbon stainless steel, its technique parameter is fit for API Spec-7 standard. All threads are phoshated, cooperized or cold worked. We provide pressed steel thread protectors free. ... |
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| Spiral drill collars are made of 4145H Modified CrMo alloy steel. Its technical parameter meet API Spec-7 standard. We provide pressed steel thread protectors free. ... |
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