This is yet another model of droid that the Techno Union built for the clone wars.
They stand about 20' tall. I added some minifigs to show the scale of droid.
They carry two twin blaster cannons. The droids were not fitted with knees to improve their stability. But their size made them very slow, but their extremely heavy armor made them a very dangerous enemy. The easiest way to deal with them was to either destroy it's one and only photoreseptor or take out it's waist with explosives or heavy cannon fire.
Glitches in it's programming made it dangerous to it's enemy and it's own kind. They were known to step on anything that got too close, clones and battle droids alike.