This is a bracket for steel D-rings approximately 22 mm wide. It has a opening to accept a 6x2 disc magnet which will prevent the ring from moving when not in use, and is to be attached with two M3 screws. It's designed in such a way that the D-ring will never be able to physically contact the surface the mount is bolted to so there's no chance of scratching or damaging the finish.

I plan on testing the breaking strength of the mount in the future, but in my simple testing, it's more than strong enough for my purposes even in PLA. If you're looking to attach a shoulder strap to a piece of equipment, two of these should do fine.