GL-9R Sabotage Droid

The GL-9R Sabotage droid was a model of sabotage droid.

Appearance
The droids had a squarish torso, with two red, squarish photoreceptors on its front, as well as a front hatch which opened to reveal steel plates, or "teeth". They had four long arms that allowed them to tear into starships.

History
Also known as Gulper droids, these droids were originally conceived by the Commerce Guild to sabotage Republic Capital Ships and eat through their hulls. They came with steel plates, or “teeth”, that could eat through any material, as well as a retractable knockout gas tube and a database of over 5 million types of capital ships. They were used in a few battles, before being replaced by the Pistoeka sabotage droid. At the end of the Clone Wars, Emperor Palpatine gave out the signal to shut down all Separatist droids. The droids were eventually sold to the Imperial Navy, to help them capture and commandeer rebel ships.

Behind the Scenes
The GL-94 Sabotage Droid is an expanded version of the Flying Space Gulper, a.k.a. Sludgegulper.

Source
The Complete Guide to Droids