... our current product list as below:1. Impregnated diamond core bits2. Surface set Diamond Bits(coring bits and non-coring bits)3. Casing ... . PCD bits (coring or non-coring) 6. Core lifters, core lifter cases7. Diamond circle wrench8. Core barrel and accessories,B, N, H and P ... &H overshot.10. B, N, H, P, NT, HT, PT drill rods and BW, NW, HW, PW casing.11. water swivel12 ...