Well, I received them in the expected time. I haven't tested all of them on aluminum yet, so I can't be too sure of their tolerances and durability. They work very well with acrylic and wood. My only complaint is that they weren't labeled, they're really hard to miss which to be honest, but that would be a nice touch. I've seen some Chinese versions of these much cheaper, I wonder if there's a difference, but that reassuring TiAlN coating caught my attention.