Straight Edge / Ruler Holder

I created this ruler / straight edge rack to pair with my Starrett Combination Square Holder. This design holds 5 straight edges up to 4mm thick in a 1x1 box. Most ruler holders store them flat, which doesn't allow easy access. There are a few that stand them on edge like this, but the slots on the ones I found were not wide enough to hold thicker straight edges like the ones that attach to a combination square. I also prefer this design because I was able to get 5 straight edges in a single 1x1 box where as others seem to only hold 1-3.