Grinder accessories for #12 or #22 hubs. Includes knives and plates from 1/8" to 1/2" sized holes. Cutting knives are hardened carbon steel and are re-sharpenable, made in the U.S.A. Grinder plates are made in Germany of chrome/vanadium alloy steel with the maximum number of holes drilled. These parts can be used with any standard grinder which has a #12 or #22 hub.