Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:3210172.

I wanted something to hold my Wera bottle opener to the side of my computer case, so I scaled the original down by 19% to better fit the bottle opener, removed the peg board fittings and added a pair of rebated rectangles to fit 20mm wide, 6mm tall and 1.5mm deep magnets.

The Fusion 360 file is attached, feel free to use it, as long as you credit Peaches491 and preferably myself.