One tool every gearhead should have and why

I have a little 1/4" Westward tool ratchet, that ratchets with a fine tooth, but if you are in a tight spot , the handle will turn like a screwdriver so that you don't have to swing the handle back and forth. Invaluable when you need it.
WESTWARD RATCHET BLK CHROME ROTATOR 1/4IN DR - Hand Ratchets - WSWSAB14R | SAB14R - Acklands-Grainger, Canada