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PDC drill bits for coal mine drilling:
specifications:25mm 28mm,30mm,32mm,36mm,42mm,
thread size:M14X1.5 M14X2 M16X2 M1/2X12
this product have economic cutter with good impact resistance.it out performs displays remarkably.good abrasion resistance improved bit life and rate of penetration
anchor shank drill bits suitable for soft medium or medium hard stratum
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