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3D/5D/8d/10d Internal Cooling Carbide Bit Non-Standard Diameter 10.0-31.0mm Jcd Crown Drill Twist Drill Crown Internally Cooled Drill Bit, Find Details and Price about Indexable Drill Bit High-Speed Drilling from 3D/5D/8d/10d Internal Cooling Carbide Bit Non-Standard Diameter 10.0-31.0mm Jcd Crown Drill Twist Drill Crown Internally Cooled Drill Bit - Shandong Denso Precision Tools Co., Ltd.