These strap buttons are good, they're easy to fit and they do the job. They could easily take a strap made of a really thick material.
The only thing I forgot to check before I ordered is that they don't come with a felt washer. Not everyone uses them but I was fitting it to the neck heel of a brand new acoustic so the surface is really quite curved and I felt it was essential to have something to buffer the force of the button screwed against the wood. In the end, I cut a little circle of felt from some I had at home.
In all, great product, shame they don't come with felt.