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7 5/8 Reg 6 5/8 Fh 5 1/2fh Nc50 Nc 38 Non-Magnetic Drill Collar P530 Material, Find Details and Price about 3-1/8" to 14" 4145h; 4145h-Mod from 7 5/8 Reg 6 5/8 Fh 5 1/2fh Nc50 Nc 38 Non-Magnetic Drill Collar P530 Material - Dezhou Rundong Petroleum Machinery Co., Ltd.