The CARL GP-2630 is an invaluable tool for the office environment and stationery enthusiast! It works with A4 and B5 paper as well as with A5, B6, 8.5" x 11" Letter-size paper, and any other paper up to 29.7 cm (11.6") long. It can punch up to five sheets of paper at once, and the holes it punches line up perfectly with the rings.