Utility Screwdriver / industry

This design comes from some daily details.
Different sizes of screwdrivers can rarely satisfied our needs,
they are too many to bring and occupied too much space.
Apart from that,women and children often feel it tough to
screw it tight.
Considering the annoyances aboce,
if the screwdriver can be rolled over to 90°，it will be more
strenth saving.
Put the screwdriver blades into the bottom of it ,you can
easily change different blades to your needs.