Wanted to try something like this. Got sizes off the web. The holes for screws are bored 6.4mm and the insides are reinforced by design. 4.8mm thick on the fattest part, 1.6mm in the center. If you use it please post a make so I can see because I won't be building my computer till later this year ;D
Update 1: Added another one with a twist, literally lol.