Pegboard hooks - stubby, wide
This is a remix of the original 'Pegboard hooks - stubby, in 3 thicknesses' from https://www.thingiverse.com/thing:2088040.
I made the overall shape to be approximately 1.25cm wide, and angled upwards in the center by 0.1cm, to fit a bit more snug with a pair of wire cutters that I had.