Magnetic Pick-up Tool

I've found a magnetic ferrite ring in my hardware shop and I've decided to make a Magnetic Pick-up Tool (I don't even know if it's the real name). Basically, it's just an handle with a magnet at the end, usefull to find lost screw or other metallic stuff dropped.

The magnet I've found have a 22 mm internal diameter a 50,5 mm external diameter and a "thickness" of 10 mm. I don't know if there is a "standard" for magnetic ring, but If you find a magnetic ring with different size, feel free to ask in the comment and I'll upload the stl

Once printed, just put the magnet inside the handle and screw the cup. The magnet may wiggle a little