If your mixer has a 1 3/8" diameter (No. 12) front hub hole this attachment will fit. The shredder discs are sold separate. They are all listed as related products in the "product details" tab. I have also attached several discs below for your convenience.
No, this Alfa GS-12 Grater/Shredder Attachment will not fit your H800 model mixer. You'll want Hobart part #VS9. While we don't currently stock this attachment, we special order for customers on a daily basis. Please give a member of our Tundra Restaurant Supply team a call at 1-888-388-6372, and we'll be happy to order this part for you.