... manufacturer 2.BW,NW,HW,PW,SW,UW,ZW 3.NX,HW,PX,SX, 4. 46,56,66,76,86,101,116 ... .30mm PW: O.D.139.70mmSW : O.D.168.30mm UW: O.D.176.20mmZW: O.D.219.1mmFlush-jointed casing ... geotechnical applications. DCDMA Casing tube(BW,NW,HW,PW,SW,UW,ZW) & (NX,HX,PX,SX)