Flathead Screwdriver (Wedge, Lever)

The flat head of the screwdriver acts as a wedge in order to screw in the corresponding slotted screws.  The handle, whose grip has a diameter wider than the screw, acts as a lever, providing maximum torque.  The center of the screwdriver acts as the fulcrum that the grip moves around.
15th floor Castilian Dorm
by Ryan Gandy