The sausage maker has a plate and knife stone kit you put in your grinder with the plate or knife depending on which you are sharpening. It did work but it is a stone and can break which is what happened to me My family has been processing our own meats for years and my dad showed us you can put your plat or knife on fine sandpaper on a flat surface and work them on the sandpaper. I have done it for years and it works good. Some may say this is not a good practice but if you only have dull plates/knives and buying new what do you have to loose??