... surface-set diamond core bit, diamond casing bit, diamond casing shoe bit, casing shoe bit, reaming shell, diamond ... core lifter case, Core Barrels, etc.X series casing (Casing Type: NX : O.D.88.9mm HX: O. ... important when drilling to greater depths.W series casing (Casing Type: BW : O.D.73.0mm NW: ... far the most popular type of casing used in geotechnical applications. DCDMA Casing tube(BW,NW,HW,PW ...