Seem to work pretty good
The post Protectors from Atlas work very well. I just had to shoot them on purpose to see if they would break or damage easily. They did not break or weaken inappropriately.
atlas product buyer,
These post protectors did a nice job of minimizing the splash damage to my 2x4 target posts. The included lag screws were a nice surprise as well. They were definitely a good investment.
I just wish you would offer it in longer lengths, most of my target stands has the 2x4's horizontal and I wouldn't have to drill as many holes, this causes me issues on where I can mount the targets on the 2x4's.
These work great when teaching students who sometimes shoot low. Get them spray painted and they will show the impact points.