Blade milling isn't the best as other reviewers point out. About half the blades in my set have one or two tiny prongs on one side of the main blade. Nothing is as big as one reviewer drew; Almost invisible. The serrations are all in the same spot regardless of blade size, leading me to think it could be part of a handling mechanism bumping against that spot on the blade and creating a tiny notch. I've used 3 bits so far and they've all cut nice holes with perfectly flat bottoms so I can't see where the notches are detrimental at this point. Of course, they do not need to be sharpened before use. I think if someone expects perfect beats they have to spend 200-300 dollars. Personally, I don't use them every day, so that was a good deal. However, Joniko should consider fixing this error as it probably won't. be it difficult or expensive.