The screwdriver is used to open vents and can be used as a weapon, though it is poor. It can be bought from inmates, found in inmate desks, or found in inmates' inventories when they are knocked out. It cannot be crafted. It is used to craft a powered screwdriver.
The screwdriver can also be used as a chipping tool for walls. It can chip through a wall by 15%, losing 10% durability each time it is used.