Armature-class Assault Droid

The Armature-class Assault Droid was a new model that was designated as the first of the next wave of droids manufactured by Cylon Cybernetics. The initial design began shortly after the Battle of Taylon involving the Cylon Imperium, and the first prototypes were ready for testing shortly after the Sith-Cylon War. Darth Trayus decided to field-test the droids during his attack on Taylon; a test that would prove the droid design ready for combat.

Characteristics
The Armature-class Assault Droid was built specifically to provide an effective means of anti-troop and anti-tank support for the Cylon Imperium. It was capable of fighting most types of combatants, with the exception of larger and more powerful vehicles such as the AT-AT Walker.

Armatures were capable of operating in two modes; a starfighter mode allowing it additional mobility, and a walker mode, revealing its deadly arsenal. It was capable of transforming between these two modes fast and efficiently.

One hand was a graple-arm with large pincers, the other a laser cannon and two heavy repeating blasters. The four arachnid-like legs made it move easily over various terrain and the forelegs also had small but powerful pincers that could crush a human. The top half of the droid could pivot from side to side and up/down. The circular shapes above the arms served as mounting brackets for mission-variable equipment and armament.

In flight mode, the droid's legs folded up and the hip socket retracted into the main body. The arms folded in and the thrusters extended while the tail folded down and out. Despite its size and complexity, the transformation was quite fast and quite fluid.

Source
General information courtesy of Lupis the Bold on SWAG.