This is Delta no. 17-913. This is a 5/16" x 5/16" morticing chisel. This is an earlier version made in Japan before they moved production to Taiwan. Only one available. There are no returns on any of the items in the NOS catagory. Please look carefully to be sure it will fit your machine. Email me if you have questions. Shipping on this item is free via USPS or UPS. I do combine shipping wherever possible. I do ship internationally. Just email me and I will quote shipping to your country.