Love this thing.  It works perfectly even for my fairly small-eyed embroidery needles.  The needles must have the long opening, though, This threader won't work for the small round openings in quilting needles.  I put fairly strong matching round magnets on the inside and outside of my plastic box of embroidery thread--so they are back to back on each side of the plastic cover.  They hold one another in place and give me a magnetic spot both inside and outside the box.  This gives me a place to keep the threader inside the box when storing as well as one outside for when I'm working on something--hope that makes sense.  This has made it much easier to keep track of this small, thin threader while embroidering.