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Hex Shank / M14 Shank Diamond Core Drill Bit for Drilling Granite, Marble, Concrete, Stone and Tile, Find Details and Price about Drill Bit Core Drills from Hex Shank / M14 Shank Diamond Core Drill Bit for Drilling Granite, Marble, Concrete, Stone and Tile - QINGDAO GOLD FIRST SAW INDUSTRY CO., LTD.