I'm lucky to have an assortment but the one screwdriver I like has a removable shaft with a reversable bit on each side. The bits are a combo phillips/slotted and one is a little bigger. Without the bit in the shaft is acts like a 1/4 driver on one side and 5/16 on the other. Not sure on the metric conversion though but they only cost about 5 dollars and have at least 7 tools if you count using it to pry stuff.