Casing Tube 1.We are manufacturer 2.BW,NW,HW,PW, ... ,76,86,101,116,131,146 WCasing Tube (X and W Series)We are leading manufacturer of Impregnated/ surface-set ... shell etcSpecialized in producing of varies diamond drilling tools, such as impregnated/ surface-set diamond core bit, diamond casing bit ... Bit, core lifter, core lifter case, Core Barrels, etc.X series casing (Casing Type: NX : O.D.88.9mm HX: ...