M3 x 16mm fit the bracket for the hotend on my Ender 3 V2 Neo. Now it has two matching screws and lock washers. Do you just put the lock washer on? Or do you have to do something special after it’s put on? No idea, hopefully they don’t fall off. They use a 2.5 socket instead of a 2 like the original screws. You could probably just not use a washer too.
Checking the bed leveling with Bed Visualizer, to see if it even matters, I doubt it does. Before I had the same screws, but one was missing a washer.
Not sure why the non screw part is bigger on these screws, guess cause somebody else made the screws. Almost looked like they might be too long, but they work. The set has 12mm screws too, so if they were too long, I could have tried those.
Well, looks about the same, so don’t ask me what the point in those washers is.