This is a peg board hook sized for 1/4 inch holes spaced 1 inch apart. I picked up the pegboard from Lowes.

I know there about 100 similar designs on thingiverse, but none of them seemed to be sized correctly, have a locking feature, and some design for strength.

I modeled this in freecad. The source file is attached to the make if you want to modify.

Update 5/1/16
Added clip model

Update 4/30/16
Added:
-storage boxes ("big" and "normal" sized)
-special hook to hang storage boxes (also used to hang small tools or lanyards
-pegboard label (use blue tape or something and sharpie)

Update 4/17/16:
I added a stronger hook and a straight hook. I also added a spacer used to hang or reinforce a pegboard. In my application the Rubbermaid "roughneck" shed had just 4 hangers for a 2x4 ft pegboard. I added 8 more mounts using these spacers and 1/4 inch screws.