I have a small recess in my workshop and it is wasted space. I was looking at ways to make this more usable, and came across these small brackets at my local Home Depot. I decided that for the reasonable price I might be able to use these in the space to create a small storage system.
The price was fair so I purchased two, and after seeing the quality and performance I got from them I returned to purchase another. These are mounted by a series of three screws, which can be anchored either with drywall mounts or directly into the stud. On one side of the wall I was able to mount them directly into a stud, on the other I had to use drywall anchors. After that, I used a piece of 3/4" pvc to create a bracket and it fit absolutely perfectly.
I use them to store various tape and strong, and the ability to lift out the 3/4" pvc rod to quickly remove items is tremendously helpful. Several of my friends commented on the design and have replicated it in their own shops.
I'm not sure how these would hold up in a larger closet, and question the strength of how much weight they could actually support, though for my application they really worked wonderfully. I absolutely recommend this product for its five star quality, price, and functionality.