These are the no see 'ums of the crimp world. For those of you who live somewhere else, a "no see'um" was an 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 1 mm. Made in America.