Core Drilling Rig, Diamond Core Bit, PDC Bit manufacturer / supplier in China, offering 76mm 101mm T2 Impregnated Diamond Core Drill Bit Nq Diamond Bit Drilling for Core Drilling Mining Tool Hard Rock, Precision Diamond Core Drill Bit Set for Enhanced Performance in Tough Materials, Factory Direct Nc50 Thread 70mm PDC Diamond Drill Bit High Temperature & High-Efficiency for Oil / Gas Drilling, Coal Mining Tools and so on.