This is a good purchase that I've made which will really help me in my phone repair. Screwdrivers that I have to purchased previously are not that great of a quality however these bits are very durable and are also magnetised so they pick up the screws once it's out of the hole. There is also a flexible one which can screw onto the screwdriver and it can allow you to get into tight spaces which is a nice addition. It all comes in a well organised and sturdy box to store all the pieces. There is is many bits which is very useful for opening up phones as they contain lots of different screws inside. Also more common bits are in a pair so you have a back up incase you lose them or the bits wear down which will happen eventually. The bits go directly into the screwdriver by magnetic force and no need to screw in the bits. This makes swapping bits very easy and quick.