경질 지층 방향타공용 216mm 다이아몬드 PDC 드릴 비트 (더블 콘 및 4 블레이드 디자인)

8 1/2in 216mm Oil Drill Bit Hard Strata Directional Diamond PDC Bit Made in China 8-1/2″ (216mm) XHY Diamond PDC Bit for Hard Strata Directional Drilling and Hard Strata Speed-Up XHY Series Features Suitable for improving directional drilling efficiency and overall drilling efficiency in hard ...