This object has a small hole for a screw. The screw holds the cleat against a surface and something else (like a shelf back) rests on the top of the cleat.
Designed in trueSpace and printed on an Up!3d printer.
Download the STL file, scale the cleat to fit your particular need, print it out and screw it to another surface. It is meant to hold up another object that is near a vertical surface.