... Tube 1.We are manufacturer 2.BW,NW,HW,PW,SW,UW,ZW 3.NX,HW,PX,SX, 4. 46,56 ... , TC shoe bit, Thin Wall Bit, core lifter, core lifter case, Core Barrels, etc.X series casing (Casing Type: NX : O ... in geotechnical applications. DCDMA Casing tube(BW,NW,HW,PW,SW,UW,ZW) & (NX,HX,PX,SX)