Casing Tube 1.We are manufacturer 2.BW,NW,HW,PW,SW,UW,ZW 3.NX,HW,PX, ... .X series casing (Casing Type: NX : O.D.88.9mm HX: O.D.114.30mmPX: O.D.139.70mm SX: O ... when drilling to greater depths.W series casing (Casing Type: BW : O.D.73.0mm NW: O.D.88.90mmHW: O ... type of casing used in geotechnical applications. DCDMA Casing tube(BW,NW,HW,PW,SW,UW,ZW) & (NX ...