These were a great addition. I had pieces everywhere and decided I had wall space so might as well. I got them on Amazon. There were mixed reviews, but I decided at that price, even if I have to add a screw or two, I’d be ok. Guess I got a lucky batch because everything was there…in both sets.
I attached them directly to the studs with 3” (maybe 3 1/4”) timber screws. I went every other stud just for extra support on the long boards and extra racks for shorter ones.
There is no bowing in the boards and these seem pretty solid holding everything I could pile on it. I plan on ordering more because it didn’t take long to fill them up.