Round Upform Burring tools are used to extrude a hole vertically to increase the material thickness. This allows more strength for threads when tapping or driving in self tapping screws. The form can also be used for support when inserting bar/tube into a product.
By the way, you can also find tools and accessories for the production of threads in our inquiry portal at https://shop.amada.de/stanzen/werkzeuge/gewindewerkzeuge.html