... ,HW,PW,SW,UW,ZW 3.NX,HW,PX,SX, 4. 46,56,66,76,86,101,116 ... diamond core bit, diamond casing bit, diamond casing shoe bit, casing shoe bit, reaming shell, diamond reaming shell, TC core ... bit, TC casing shoe bit, TC shoe bit, Thin Wall Bit, core lifter, core lifter ... HX: O.D.114.30mmPX: O.D.139.70mm SX: O.D.168.30mm)Flush-coupled casing tubes have ... ,PW,SW,UW,ZW) & (NX,HX,PX,SX)