... of diamond bits,reaming shells,casing shoes,PDC bits,wireline drill rods,casings,core barrels for mining,exploration industries in China. our ... bits4. Reaming shells5. B, N, H, P, NT, HT, PT drill rods6. BW, NW, HW, PW casing.7. Core barrel and ... non-coring)10. B, N, H, P, NT, HT, PT drill rods and BW, NW, HW, PW casing.11. water swivel12. casing ...