Wow, this is just a beautiful leadholder.
Made by Staedtler Japan, it has a number of interesting features, not least of which is a push button advance. The 2.0mm lead advances by clicking the cap. It functions just like a regular mechanical pencil, but with 2.0mm lead. Very nice.
It has a cylindrical sleeve, a knurled grip similar to that of the Staedtler pencil holder, lead degree window, a clip, and the lead diameter printed on the cap – as if there could be any doubt!
The general intent seems to be to bring mechanical pencil features to the 2.0mm leadholder. It may not be to everyone’s taste, but in addressing the chosen task, I think Staedtler has succeeded!