There are different kind of pegboards. They have different spacing between the holes, the holes itself have different diameters.

This thing aims to address all the different kinds of pegboards: You can customize the spacing between the holes, the diameter of the holes itself and most importantly the length and heights of the hooks.

I suggest printing a couple of these at once (especially when printing rather small ones), so the pieces have a bit time to cool down between the layers, otherwise they tend to warp.

The attached STL is an export with the default settings.