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Wholesale Price Automatic Miner Parts 3 Blade Diameter 65 mm Concave Coreless Drill Bit for Water Well Drilling Bit, Find Details and Price about Wing Conventional Concave Drill Bit<br />Medium Packing & Delivery from Wholesale Price Automatic Miner Parts 3 Blade Diameter 65 mm Concave Coreless Drill Bit for Water Well Drilling Bit - Qidong Fengsu Drilling Tools Co., Ltd.