... NQ, HQ, PQ drill rod 2. Tapered drill rod, integral rod 3. Twist rod, extension rod, exploring water drill rod Specialisted in producing varies kinds ... China, including of twist drill rod, extension rod, tri-angle rod, integral drill rod, water exploring rod, tapered drill rod, etc. ISO certificate & quality ... Series: RW, EW, AW, BW, NW, HW "WJ"Series: AWJ, BWJ, NWJ, KWJ, HWJ Metric Series: 33, 42, 50 ...