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Product: Vacuum brazed diamond core drill bit with female thread  Price: Bargain  Delivery Period: Shipped within days from the date of payment of the buyers. Last Updated: 10 Sep,2012   Valid Until： Long-term effective

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