The rivet consists of two parts. The head of the rivet has a diameter of 5 mm.
The pin is about 2.3 mm in diameter. This means that you have to punch a hole with a diameter of at least 2.4 mm in the leather. The pin is about 4 mm long, which means that you can join leather parts with a total height of 4 mm and less. Both parts of the rivet are put together and pressed together with pliers or a hammer.