I am selling 3/8'' Steel Discs that are 16.50'' in diameter.  A36 or better steel.  If you want to order multiple pieces, check with me on shipping before paying - I may be able to do better. 

Check out my other auctions -  I can cut all sizes, shapes, and thickness of steel if needed.  

I would be happy to give you a quote. Please ask if you have any questions at all!