... ,NW,HW,PW,SW,UW,ZW 3.NX,HW,PX,SX, 4. 46,56,66,76,86,101,116,131 ... ,146 WCasing Tube (X and W Series)We are leading manufacturer of Impregnated/ surface-set diamond ... HX: O.D.114.30mmPX: O.D.139.70mm SX: O.D.168.30mm)Flush-coupled casing tubes have a ... . This can be important when drilling to greater depths.W series casing (Casing Type: BW : O.D.73.0mm NW: ... ,NW,HW,PW,SW,UW,ZW) & (NX,HX,PX,SX)