Hanger Hole Hook / Keyhole Hook

I'm unsure of what the name for this would actually be - the closest thing I could find for the name of the hole this hooks into is "Hanger Hole" but we had always referred to them as "Keyholes".

My lack of knowing the name made it really hard to find one on thingiverse, so eventually it was quicker to just model my own.

I keep my printer on a shelf that has these holes along it in order to add shelves/adjust the shelf heights, and figured I could use them to hang up some items that I tend