I bought these stuffing tubes with the aspiration to make breakfast & slim jim type sausages from the home-grown beef, pork, and venison that comes into this household. I bought 21 mm collagen casings to use on the smallest stuffing horn, that was the size I wanted. Well, the smallest stuffing horn is tapered, you can only fit 1" worth of 21 mm collagen casing on it. Would give it zero stars if I could. Absolutely dissappointed with this product. Buy a metal tube stuffer, forget the kitchenaid garbage.