Non-magnetic drill collar, as per API standard

Non-magnetic drill collar, specifications:
Standard: API 7-1
OD : 3 1/8''---11''
Length 10'--31'
Non-magnetic materia
Other materials: AISI 4145 H / 4145H Mod

The products are of high quality and with BV inspecition --International inspection
Optional Information
- Payment : T/T
- Origin : China
- Packaging : standard export package
- Inspection : TPI
- Samples : Free