These weight pegs are solid, very well built and I like the design.
The only thing is that the weight pegs are actually closer to 1.5” or 1-5/8” in diameter so your 2inch Olympic plates just hang and there is a noticeable gap. I’d prefer these to be 2inches or 50mm in diameter so Olympic plates fit snugly.
I would also suggest to include rubber/neoprene washers instead of one metal washer so that both sides of an upright are protected.
Lastly, since this design is single hole mounting, people can repurpose these as handles. You could market this as such. I would suggest swapping out or selling an optional knurled/hand nut so that it would be easier/quicker to remove these.
I am working on a 3D printed one because I’m using these as belt squat handles and would want to have something I can easily remove the nut once I’m down without having to use a wrench.