Marker Paint Holder

This spray paint holder has a bunch of holes in the back which I press 6mm round magnets into. Then the print sticks to the hydraulic tank on my skid steer, and I have quick access to marker paint. Magnets are 4mm high, 6mm round. I can't drill into the hydraulic tank so the magnets work great. I had to make it a bit smaller to fit on my 180mm printer with clips holding the glass bed down, so some magnet holes were cut in half