These are the no see 'ums of the crimp world. For those of you who live somewhere else, "no see'um" was an American Indian term for an aggravating bug so small that yes, you couldn't see it. These, the mini crimps, are meant to be stations on a necklace or other piece of jewelry. It is doubtful that you will get a wire through it twice. 1 x 1mm. That's small.