This is a die for a hand press, used for leathercraft. It is sized for large spring snaps (12mm / No. 5). Normally, you would use a punch and anvil to attach these, but you may find that you often fail. If you use this correctly, you can easily attach them with almost no failures and without any stress. Since you can work without using a hammer, people in apartment buildings or those who want to work late at night can concentrate on their work with peace of mind. Of course, it can be used for handicrafts other than leathercraft. Upper die: M8 screw Lower die: Approximately 18.7mm I also have other leathercraft supplies for sale. If you would like to purchase them together, I can discuss the price, so please take a look if you'd like. Leather tools are here ↓ #YLWorksLeatherTool #handmade #Leathercraft