Sometimes it can be hard to handle an iPhone, considering they have a number of small screws of different sizes and lengths. They can easily get lost or mixed up. iScrews can help you with that. It has a layout with a printed iPhone on top and holes to put in the screws at the right position. So you always remember the position of each screw and it prevents you from mixing or losing them.
Available in versions for iPhone 3G/3GS, and iPhone, 4S, 5, 5S, 5C.