Metal Food Grinder Attachment for KitchenAid Stand Mixers Included 3 Sausage Stuffer Tubes & Kubbe Meat Processor Accessories

I’m trying to buy this item again and it’s not letting me why ?

I see there is a a big discount with the coupon, so low price for grinder attachment, is it really metal?

Does this set come with a storage box?

I plan to make 30lbs ground meat for burger and meatball, it would take lots of time if use my manual hand grinder. could i use this attachment work f