COL-A01 Uber Droid was a model of a huge battle droid, produced during the Great Galactic War

Great Galactic War Event Great Galactic War (3681BBY - 3653BBY)

and later. Among various droid manufacturers it was also known as battledroid_collector_a01_v01. Like most battle droids of that era, it was built on a tri-legged chassis with a "head" module mounted on it. Instead of built-in weapons, his manipulators ended in three-fingered hands. Being 6.5 times the size of a common battle droid, it was very rare and expensive, and, arguably, one of the biggest known droid designs.