I have an old stapler that I had used for Decades but ran out of staples. I couldn't find the staples that it took, ACE 2025. The staples I tried didn't fit. One of the clerks that has helping me look checked online about the Aceliner stapler and was able to find that it loaded from the back rather than the top which I had forgot about. He got these staples, we got it loaded, and they work great.