Get that project off your desk and onto the fridge! These standoffs will work with anything that uses #4 mounting hardware (most Arduino models and many other hobby electronics). This product is a set of four standoffs.
Assemble with 1/10" Diameter 1/16" Thick Magnets (not included), such as K&J Magnetics DH11. 3 magnets per standoff. Press into place with a dab of super glue.
Nuts are standard #4 hex machine nuts (such as McMaster #90480A005). Screws are #4, 5/16" long, fillister head screws (such as McMaster-Carr #91794A107). One nut and bolt per standoff.
I've only personally had these printed in "Polished Strong & Flexible Plastic: Purple" and "White Strong & Flexible Plastic". If you have them printed in any other materials and send photos I'll upload them and give you a shoutout! As with all my designs, I have set my "markup" on this design printed in any material to $1 or less.
Check out this "9V Battery Magnetic Holder" to power whatever it is you're holding up!