... & Tungsten Carbide Casing Shoe Or Casing Bit. Casing and rod shoes are designed to drill in casings or rods, BW, NW ... , HW, PW etc. casing shoe are available. The "CROWN" impregnated diamond ... : BQ,NQ,HQ,PQW Series: RW,EW,AW,BW,NW,HW,PW,SW,UW,ZW,HWT,PWT,BWS,NWS,HT,PT ... Series: 46,56,66,76,86,101,116,131,146 HW Diamond Casing Shoe