The pic isn’t very clear, I’ve enlarged it a little. There are ridges to grip pipe or nuts. I dare say with hard use they’d soon get worn down, but as they are they help a lot.my leatherman already comes with in-built "ruler" and a hexagonal hole is out of my league (with the tools available), but two holes of different diameters and the material in-between cut off (at least that what it looks like to me on the photo?! ) could be doable at home, too...