API 7-1 High Quality Standard Oilfield Equipment Petroleum Non Magnetic Drill Collar Non‑Magnetic Drill Collar is a vital down‑hole drilling tool for well survey and measurement. Manufactured with special non‑magnetic alloy material, it avoids magnetic interference, ensuring accurate reading of MWD/LWD measuring instruments during directional drilling. Produced in compliance with API 7‑1 standards, it features high tensile strength, great torsional resistance and outstanding