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Coal mining PDC Core Drill Bits 60mm 75mm 92mm 113mm 133mm 153mm 160mm 180mm 203mm, US $ 25 - 200 / Piece, Henan, China, Drills-King, DXQK56-153.Source from Henan Drills-King Mining Technology Co., Ltd. on Waimaotong.com.
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60mm 65mm 75mm 85mm 94mm 113mm 135mm nq hq pq bq aq sds Max PDC Core Bit for Coal Mining
56mm 75mm 94mm 113mm 133mm 153mm Diamond pdc Coring Drilling Bit for Coal Mining
China Coal Mining Power Drilling Tool 2 Wing Tungsten Carbide Coal Drill Bit