Jig for laying out holes at 0.5 and 1.5" from edge

I needed to markup a lot of holes on 1" centers and 1/2" from an edge, so I made this very simple jig to make life easier. It worked well, so just in case it's useful to you, here it is :)

There is a slot in the middle with angled ends for lining up with a distance mark as well as triangular notches at each end. The two holes are conical to give good alignment on an automatic center punch, and there is a lip which aligns with the outer edge. It's really very quick to use compared to measuring