laco

Hello, I am trying to replicate square holes in leather. They are: 1x1mm thick & 2mm apart. I was unable to find a tool like that online, most tools perforate round or diamond holes, or the holes are too big. I was thinking about making my own tool as well, however I am not sure where I would go about getting square-shaped pins. Here's a picture of what I am looking to do: Thanks!