PDC 로크 비트 HDD 엑센트릭 리밍 156mm 확장 된 구멍 지름과 GII 절단기 유형

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 ...