Chosen Solution

So I have a micrometer and a set of screws. As the iphone 6 I got had 4 missing I guessed this would be the only way so I literally measure top to bottom of the screw with this device yes? It also occurred to me…how many screw types are there in an iPhone 6 and are all the 1.2 / 1.3 etc. the same or are some different in had size or thread width? And if they are the same where could I get a set of just one type and store it in different compartments so I can just grab then when needed already sorted? I’m assuming a generic screw is not going to work? Thanks.

You can get screw sets for certain phones. If you look on iFixit, Ebay or AliExpress you will find them The iPhone 6 has many different types of screw