The clips are designed for use in 1/4" thick pegboard with 1/4" holes. These ones are designed for 1.5mm thick item to mount to the pegboard. After installing the pins, use a short length of 1.75mm filament to lock the clip in position. To remove use a longer piece of filament to push out the locking piece.
A step file is included to modify if that is easier for your cad program.