API Spec 7-1 Oil Drilling Lifting Sub 5'- Nc50 AISI
Drill Collar Lifting Sub 127mm-Nc50 API Spec 7-1 API Spec 5dp Oil/Gas/Water Drilling Drill Pipe Drill Tool 127mm G105 or S135 AISI 4145h Oil/Gas/Water Drilling Heavy Weight Drill Rod/Drill Pipe O. D 127mm with API Spec 7-1
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