BQ колонкового бурения стержня

BQ core drilling rod AQ core drilling rod, BQ core drilling rod, NQ core drilling rod, HQ core drilling rod, PQ core drilling rod, AW core drilling rod, BW rod core drilling rod We can produce three threatment of the core drill rod1)Whole heat treatment of the whole core drill rod, then heat treatment the screw the secondtime. The best quality in China. Can use together with Longyear company product2) screwthread heat treatment.3) chrome plating thethread of the drill rod We also produce BQ, NQ, HQ, AW, BW rod,NW rod etc All our product is produce according to internation standard