API 7-1/7-2 Drill Collar 127mm -Nc38 AISI 4145h

China API 7-1/7-2 Drill Collar 127mm-Nc38 AISI 4145h, Find details about China Drill Collar, API 7-1 from API 7-1/7-2 Drill Collar 127mm-Nc38 AISI 4145h