Review on MTMTOOL Screw Stainless Steel Expansion by Charles Palma

I gave 3 stars because technically they do exactly what they're supposed to, but they don't fit exactly and you end up with a messy hole after installation. They come with no instructions and the sales page only vaguely says how to use them. On one side it says to drill a hole to match the diameter of the bushing and then you look and say the bushing is 8mm, only problem is that the wedge that actually opens the bushing is just over 8mm amounts to. Good luck if you go to the store and find 8mm masonry bits, Lucky 5/16 is just under 8mm. Drill a hole with a hammer drill, oops, too tight. Screwing the drill in and out a few times, still too tight, you really need to rock the hole. Tada, now you have a working hole, but you have an ugly gap around the hole. Next time I'll buy an American!