Sell Vacuum brazed diamond core drill bit with thread

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Vacuum brazed tooth-type core bit is used for drilling stones with super long working life and super high efficiency. This product is a patent product in China.
Regular diameters are between 20mm and 100mm.
The core bit includes shank and thread, which consists of male thread and female thread. M14 and M5/8 are female thread. Gas thread is male thread.
There're three kinds of mesh: coarse, medium and fine.