The upper handle has been designed to make screwdriving jobs easier the screwdrivers are ideal for making alterations to your mobiles like changing the housing etc small electronic devides are often secured with slotted cross recess star socket and other different screws this 8 piece set will give you all the screwdrivers you need for these jobs and you can use them to carry out small repairs slotted 20 30 philips h1 star socket t 5 t 6 t 7 slotted nut tri wing