Diamond Tools, Diamond Core Drill Bit, Core Bit manufacturer / supplier in China, offering High Quality Core Drill Bits for Reinforced Concrete with Fast Speed., 152*450 1-1/4" Unc Robust Wet Drill Bit for Long Time Continuous Operation, Diamond Core Drill Bit with 1-1/4" Unc Thread 152*450 Fitted with Sturdy Diamond Segments for Stable Wet Drilling Performance and so on.