impregnated diamond casing bit, surface set diamond casing bit, TC diamond casing bit.. Size Available:RW, EW, AW, BW, NW, HW, PW SW, UW, ZWRX, EX, AX, BX, NX, HX, PX, SX, UX, ZX46mm, 56mm, 66mm, 76mm, 86mm, 101mm, 116mm, 131mm, 146mm...Type (according to the cutting media):impregnated diamond casing shoe bit, surface set diamond casing shoe bit, TC casing shoe bit, electroplated diamond casing ...