"A metallic crank-like object."
"A crank that belongs to something with a square-shaped slot."
The Square Crank is a key item in Resident Evil 2.
This square crank is used at the:
It can then be discarded once used in these two locations.
It is found outside Ben Bertolucci's jail cell. As this location is exclusive to Leon's scenarios within the game, the square crank cannot be accessed or collected by Claire, and the gates it is used to open cannot be opened in her scenarios.