Mũi khoan Kim cương PDC 216mm cho Khoan Định Hướng Tầng Cứng với Thiết kế Nón Kép và 4 Cánh

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 ...