Infiltrator/Demolition droid

Demolition droids were transforming droids which were used by the Confederacy of Independent Systems during the Clone Wars.

Characteristics
These droids had three formations. Normally, they disguised as innocent sweeper droids to infiltrate into the target facilities, then they turned into the form of battle droids with heavy firepower to kill anyone guarding there. Finally they transformed into explosive bombs to destroy the target. These droid had extreme tough armor plates which could withstand several blaster bolts.

History
In 21 BBY, Count Dooku ordered General Grievous to destory the Coruscant power generator by using demolition droids. Dooku managed to thwart the effort of the Senators who attempted to achieve peaceful settlement in this war. Grievous sent several demolition droids, which had stenciled on their domes "CSD," for Coruscant Sanitation Department, into Coruscant. Later, when the Galactic Senate was debating on deregulation of Banking Clan, the droids infiltrated to the power generator area and began attacking, destroying it. As a result, many Senators became fearful of Separatists and the bills of banking deregulation passed.