A: Hello. Vevor machines are made by a ton of different factories in different styles, so it's impossible to give a guarentee. These parts fit 58mm chinese manufactured dies, however most of those machines are tooled to work with the thicker plastic backs. In order for them to work with thinner metal backs, you have to insert a gasket or washer or risers into die B to get the backs to sit up a little higher in the die. Sometimes these come with the dies, but not always. Check the Becky Buttons YouTube channel for a video on how to make chinese dies work with metal suppies.