... to suit the customer's requirements4. The impregnated shoes are available in either the VV profile or flat ... give optimum penetration rates and bit life Impregnated casing shoes can be manufactured in all series and varying ... impregnation heights Surface-set Casing shoes are used in various overbruden formations.Size Available: ... Series: RX, EX, AX, BX, NX, HX, PX, SX, UX, ZX