Economy Parallel set holder

A holder for the set of Economy Thin Parallel's sold by Arc Eruo trade and others :

https://www.arceurotrade.co.uk/Catalogue/Measurement/Parallels-Angle-Blocks-Test-Bars/Economy-Thin-Parallels-Set


The holders interlock with other ones i have made, and are based on these ER32 collet holders :
https://www.thingiverse.com/thing:3588076

The screws i use to mount these to the wall are called 'Flange Head Self Tapping Screws'

Please note, the photo shows a slightly different version to the actual .stl file,
I accidentally made 5 slots for the parallels, when there should have been 4 ... and i removed the middle screw hole as it was not needed.