This is the Trumpeter 09910 Hobby Rivet Maker

A specialized modeling tool (sometimes called a knurl) designed to imitate rivets on the surface of plastic models. Its shaft (handle) is made of ABS plastic in black and allows for quite ergonomic work. It was also equipped with a relatively simple blade replacement mechanism, of which the set includes 4 pieces. They are all made of good quality steel, but differ in the number of “teeth”. Thanks to this, they can be used on models in various scales, selecting the most appropriate one. It should be emphasized that they are characterized by very high sharpness.