Sakdis Wall-Mount Connectors

4-panel and 2-panel connectors specifically made for @Combo's Modular Pegboard Panel 

I made the 4-panel connector so that you can access the mounting screw with a screwdriver, and use it to plan the holes for the 2-panel connectors. You can also use adhesive if you don't want to screw it into the wall.
These are threaded for M4 bolts.