Suction arm

The suction arm, also known as the sucker arm or simply the sucker, was the most common type of manipulator arm used by the Daleks, sporting the eponymous circular suction cup at the end. (PROSE: Prisoner of the Daleks)

Even if the Dalek died, its arm could still operate machinery for a live person. (TV: Remembrance of the Daleks) The arm also had a telescopic feature to extend its length. (TV: The Dalek Invasion of Earth, Dalek)