Review (2/5): Yes, size matters.
I have two pairs of glasses that lost a screw each. Years ago if I lost a screw I'd go to the local drugstore and buy one of the little combo screwdriver, magnifying glass, that came with about a 1/2 doze screws. I don't ever remember those screws not fitting whatever glasses/sunglasses I tried to fix.
I looked at a lot of kits that had dozens or hundreds of screws of varying sizes. I read through reviews and even with the huge selections and "variety" of screws there was a surprising number of people who complained that none of the screws fit their glasses. I decided to steer clear of those and settled on this kit because of the variety of other items included.
However, after pulling out my magnifying glass I tried each screw size one by one and none fit. Two were too large and one was too small.
Since the smallest went through the hole I decided to try using one of the nuts that came with the kit. First, I couldn't tell what fit with what because there is no guide. Second, after trying the nuts on the smallest screw I found they didn't fit.
I finally just stripped a piece of copper wire from some speaker wire I have laying around and threaded it through the hole in the glasses and tightened it down. So, at least I have something that will hold until my eye appointment and I don't have to worry about the lens popping out.
I'm keeping the kit. I'll probably just pick up a few screws from the optomitrist once he lets me know what size I need and replace the ones that are in the kit so it's not a complete loss. I'm not sure when, or if I'll need the other items that come in the kit. Also, there are things that came with it that I have no idea what they are for. One of those are some very tiny plastic cones. I'm sure they have a purpose...