I don't know how familiar you are with french cleats but the two 45 degree angles meet when you slide a holder in, so down. It holds snugly and you have to lift it up to remove it. The locking block I put on top prevents it from raising at all so it can't slide out.
I have a small 2 car garage work shop, I do a bit of everything so I'm trying to make full use of every inch for storage and infrastructure. I decided to put a french cleat wall next to the stairs so it wasn't just dead space.
I'm trying to hang mostly shallow/ thin things on it so it...