Holy crap 5/8 LOL I was going wheeling a few weeks ago and realized I didn't have a recovery point on my Jeep. So grabbed a 1" plate out of the bin and cut it into a square. Drilled a hole in it and stick welded it on my bumper with a 7018 rod. That entire Jeep could blow up fall down a mountain and that thing will still be their. Once I get my Jeep back these mounts will make more sense to me. I can't visualize how they can bolt on yet instead of welded on.