The small ones ( 1/16 hex head, I think) have a oversized hex which makes me dislike these screws. The material is good so it is hard to strip them, but still I managed to strip 1 or 2 over the months ( the screw set was for my rc10 T btw, and yes, I use a very good and perfectly sized screwdriver).
The nyloc nuts they give are pretty but the nylon gets expanded the first time you screw them, and after that the nylon doesn't grip well at all. Works like a kind of regular nut, but thicker. sweet.
I'll stay away from these screw kits from now on.