The Leitz mounting slat for your hole punch ensures the right paper is in the correct position. This frees up holes exactly in the middle of the paper. The extendable paper guide for your hole punch to align paper sizes from A6 to A4.
This is suitable for the following Leitz Topstyle punches: 5005, 5058, 5055, 5038, 5132, 5022, 5012. Not for the Nexxt series.