PDC Rock Bit HDD برلی با قطر سوراخ 156mm و نوع برش GII برای سنگ گرانیت

114/142/156mm Eccentric Reaming HDD Rock Bits Drill Bit For Granite Rock PDC High-Speed Casing Running & Reaming Bit | Polycrystalline Diamond Compact for Oilfield Drilling XSK Series Features Reading-while-Drilling Tool: Eccentric-body design (pilot/reamer ratio: 1.2-1.5) Mechanical auto-centering ...