... ,86,101,116,131,146 WCasing Tube (X and W Series)We are leading manufacturer of Impregnated/ surface-set diamond core ... lifter case, Core Barrels, etc.X series casing (Casing Type: NX : O.D.88.9mm HX: O.D.114.30mmPX: O.D ... . This can be important when drilling to greater depths.W series casing (Casing Type: BW : O.D.73.0mm NW: O ... Casing tube(BW,NW,HW,PW,SW,UW,ZW) & (NX,HX,PX,SX)