I just purchased this item.  I have had a grinder attachment for my Kitchenaid for about 15 years, but it is the original and it is plastic - granted it is a heavy plastic, but still plastic.  It works perfectly, I am upgrading to metal.  The grinder attachment itself is amazing and I use it a lot.  All the attachments work exactly as they are designed to, and work very well.  The price is right on this item, too.  Looking forward to adding this to my large collection.  A must have if you love good burgers.  I grind brisket and, short ribs and sirloin and my burgers are incredible.  But it does everything it is supposed to do very well.