Screwdriver

A screwdriver was a tool. After an infostamp left him believing he was the Doctor, Jackson Lake carried such a tool, calling it his "sonic screwdriver". (TV: The Next Doctor) Screwdrivers could be used for building cabinets. (TV: The Doctor Dances)

They could also be used as weapons. Miss Quill told Charlie to stab a screwdriver through the hand of Orla'ath - a guise of the Lankin. (TV: Nightvisiting)