... bits)3. Casing(Rod) shoes/Casing bits4. Reaming shells5. B, N, H, P, NT, HT, PT drill rods6. BW ... NW, HW, PW casing.7. Core barrel and accessories:B, N, H and PQ(Inner & Outer Tube,Head assembly, ... overshot.9. PDC bits (coring or non-coring)10. B, N, H, P, NT, HT, PT drill rods and ... can manufacture all kinds of products according to customer's special requirement. Any requirement please contact us, we' ...