This is a tool for use in model assembly.
From the manufacturer:
This screwdriver's ratcheting handle with precision 72T gear gives swift, smooth motion and no need to re-grip as you work on the screw. Change quickly between tightening, loosening and lock modes using the tab on the handle, and use the fingertip actuated Quick Rotation grip for speedy work on looser screws.
The included precision bit is crafted in durable chrome molybdenum vanadium steel, and can be used on (+) screws between 3mm and 5mm.
Magnetic bit helps prevent screws from being dropped.