Assault Daleks were special bronze Daleks equipped with laser-cutting arms and blowtorch to replace their plunger manipulator arms. They had a claw and blowtorch combination. These were used for cutting through strong metal and for picking up objects normal Dalek drones could not.
During the Second Dalek War, Dalek X had a squad of four Assault Daleks among his entourage. They were vaporised circa the 2580s at the end of the war when the Tenth Doctor blew up a disused refuelling station on the planet Hurala, taking Dalek X's Exterminator with it. (PROSE: Prisoner of the Daleks)
During the Battle of the Game Station, an Assault Dalek was sent to cut open a Hydra Combination-composed door leading to the observation deck containing Lynda Moss, with a blowtorch. It, along with the rest of the Dalek Fleet, was destroyed by the Bad Wolf. (TV: The Parting of the Ways)