These are pegboard pegs, intended to be incorporated into other models. There is a curved peg which is the main peg that will hold in your board, and a straight one for additional support/stability if needed.

These are sized and spaced 1 inch apart for typical US pegboards. For other spacing, you can move or resize them.

I posted this because I had trouble finding peg sizes that work for my pegboard, which is old and finicky, and somewhat thicker than the newer ones I've seen. It has the usual 1-inch spacing and ¼-inch holes, but I still found that some models wouldn't go in properly despite having the right dimensions. I found a steel sheet holder model that fit perfectly, so I made my own pegs from scratch with the same dimensions. I've used these pegs in several of my own models, and I'm posting the files here in case they're useful for anyone else.

STL, STEP, and Fusion360 files provided.

The other photos are examples of using them in some of my other models, namely my measuring tape holder and my pegboard cup.