This is a simple holder for small needle files. It's compatible with some cheap files I got from Temu. The shaft of the files is about 3mm and the handle that fits into the holder is about 12mm. The other needle file holders I found were not very stable, and the files kept falling out. This model should be able to hold the files in place better, but still allow for pulling the file straight out so that you can have other items on your storage wall right above this model.