This is a magnetic holder for a drill press chuck key.

The magnets are 10mm x 3mm round magnets. These are the ones I used
https://www.amazon.com/gp/product/B07D8QPG2Y/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

I've included the Fusion 360 design. The model uses parameters so you can change them in Fusion 360 (Modify -> Change Parameters) to fit your specific chuck key or different magnet sizes.