Just something I made for my Specialized Camber 29 2016 model.
The bottom bracket on my bike had some deep wear marks from cable rub from the previous owner.
So I wanted to make a plate to cover these marks and protect the frame from more damage.
To mount it, I cleaned the area with isopropyl alcohol and used some good double sided tape, and it have hold up good for a long time now.
But again this is just very a for a very very specific use on a very specific bike.
The author hasn't provided the model origin yet.