When u need to screw something into a biltema pegboard (swedish verktygstavla). Ordinary plugs usually rotate instead of fasten and expand, this design prevents rotation since it uses two holes thus makes it impossible to rotate. Install it from the backside of the pegboard.

The plug is designed to fit a pegbord with holes of size 4mm and CC 12mm (Biltema)

I used PLA 100% infill which works just fine.