The perfect attachment for a #12 hub. The Uniworld Meat Grinder attachment is tin plated and includes the following parts: 812HRWC (replacement ring), 812HWM (replacement worm), 812GK (grinder knife), 812GP1/4 (.025-inch polished steel grinder plate), 812PN (stainless steel feed pan) and 812&22PLS (polypropylene stomper #12 and #22).