... as below:1. Impregnated diamond core bits2. Surface set Diamond Bits(coring bits and non-coring bits)3. ... HW, PW casing.7. Core barrel and accessories:B, N, H and PQ(Inner & Outer Tube,Head assembly, ... N, H, P, NT, HT, PT drill rods and BW, NW, HW, PW casing.11. water swivel12. ... casing cutter13. relief valve * Above bits and reaming shells conform to Metric,DCDMA,CDDA standards. * ...