This is one of our favorite inventions by Raul Rodriquez of PrimeTechTools. It is a long term storage box for all the little screws and shields in the iPhone. (You need a separate box for each iPhone model.) Now, when a screw disappears into thin air, you can simply head to the box, match the letter on the picture of the screw, then slide the top of the box to reveal letter coded wells with replacement screws. These boxes come pre filled with screws. When you run out you can fill the box with screws harvested from donated or 'no fix' phones, or order sets of screws (sold separately). At iPad Rehab, we have a full set of these organizers and have used them many times to offer our mail in repair customers the courtesy of filling in missing screws to make sure they get back a complete phone. Love these things.