Meat Grinder Knife. Meat Grinder Plates. MPBS Industries loed in Los Angeles CA 90023. Meat grinders are use to grind or mince meat to make sausages, hamburgers, meat balls, meat loaf, etc. They are also known as meat choppers and meat mincers. Meat grinders come in several different sizes (most grinder uses grinder plate sizes 12, 22, 32 ...