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HS Code : 7307.99.00
Standard : API-5L,API-5CT
Usage : Joining Tubing
Packing : Wooden Pallet
Richsen Product
Standard : API-5CT,API-5B
Usage : Joining Casing
Usage : Thread couplings
HS Code : 7306.29.00
Standard : API-5CT
Usage : Major structural component oil well
Packing : Steel Belt
Usage : Oil extraction
Usage : Protect the thread