... Impregnated Casing Shoe, Surface Set Diamond, PDC & Tungsten Carbide Casing Shoe Or Casing Bit. Casing and rod shoes are ... etc. casing shoe are available. The "CROWN" impregnated diamond bits are the most commonly useful bits in the ... grades of high quality synthetic diamond are distributed in the depth of impregnated bit's matrix series.The ... 66,76,86,101,116,131,146 Diamond Casing Shoe / Casing Bit