... HW, PW casing.7. Core barrel and accessories:B, N, H and PQ(Inner & Outer Tube,Head assembly ... ,Locking Coupling,Adaptor Coupling,Inner Tube Stabilizer Ring,Landing Ring,Landing Shoulder etc)8. N ... non-coring)10. B, N, H, P, NT, HT, PT drill rods and BW, NW, HW, ... . casing cutter13. relief valve * Above bits and reaming shells conform to Metric,DCDMA,CDDA standards. ...