These anchor sockets are great. We installed the fence and gate combo on concrete that was poured a few months ago and the fence is quite solid. Just a few things to know if you're thinking about getting into concrete. A hammer drill is a must. A standard drill will last forever. I've read that this requires a 1/2" drill bit, but it won't help. You'll need a 5/8" concrete drill bit. Finally, and I thought it would be, cedar fence posts are actually 4" x 4", but the hole fits a 3 5/8" x 3 5/8" post. Most of the railings are cedar so I was hoping they would fit, but they didn't. Grind a little and they fit.