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My original reason for designing and making this hook/holder is for use in my glass shower to hang a loofah or rag on but I also ended up using it all around the house. My glass shower walls are 0.230" / 5.8mm thick. You will need to print 2 hooks and purchase a set of 1" N52 grade magnets if you want to use it in a shower. The round shaft portion of the hook is approximately 8mm.

I purchased the magnets from K&J Magnetics (I would post a link but do not know if that is allowed). I buy them in pairs but they can be bought singles and varying strengths.

Magnet part numbers:
RC22CS-P-N52 - 3/4" o.d. x 1/8" thick with countersunk hole for #8 screw
RX033CS-P-N52 - 1" o.d. x 3/16" thick countersunk hole accepts #10 screw

Flathead Screws (18-8 SS):
8/32 x 1/2"
10/32 x 1/2"

The screw threading holes are larger than drill spec size for screws. They are 0.177" / 4.5mm dia. hole for the 1" model and 0.126" / 3.2mm dia. hole for the 3/4" model. I use the screw to thread the holes, not a tap. I have had no issues with the screws coming loose or stripping during installation/threading.

If you need the screw holes resized or have any questions you can shoot me a message.

*8/16/19- added screw and magnet details I forgot.