Core Drilling Rig, Diamond Core Bit, PDC Bit manufacturer / supplier in China, offering Direct Factory Price 101mm PDC Diamond Core Drill Bit with Short Joint, Spring & Spring Seat – Geological Exploration Tools, Concrete Diamond Core Drilling Bit 51mm 76mm 102mm 152mm 202mm Thin Wall Diamond Core Drill Bits for Reinforced Concrete, Durable Tricone Drill Bits with Enhanced Wear Resistance for Extended Lifespan and so on.