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56mm 65mm 75mm 92mm 133mm 153mm 203mm NQ HQ PQ BQ AQ pdc Coring Bits for Coal Mine Drilling, US $ 25 - 200 / Piece, Henan, China, Drills-King, DXQK56-153.Source from Henan Drills-King Mining Technology Co., Ltd. on Waimaotong.com.