I purchased a Torx bit set from Amazon and wanted a way to mount it to my metal pegboard. The slots are 3.5mm wide, and there is a hole behind the slot for a 12mm by 3mm magnet. It's deep enough to hold two magnets, so you get some real grip strength when you put the bit in the spot.It's deep enough to hold two magnets, so you get some real grip strength when you put the bit in the spot. I'm also including the original SketchUp file, which I used to make. If you want to make any revisions, feel free.I'm also including the original Sketchup file, which I used to make. If you want to make any revisions, feel free. I'm always trying to figure out better ways to organize my shop Hopefully this helps someone else