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56mm 75mm 94mm 113mm 133mm 153mm nq bq hq Coal Mine Drill Bits Pdc Coring Tools for Sale, US $ 25 - 200 / Piece, Henan, China, Drills-King, DXQK56-153.Source from Henan Drills-King Mining Technology Co., Ltd. on Waimaotong.com.