ORM-A01 was a basic recon droid design which was used in the production of various droid models - both for military and civilian purposes - by different droid manufacturers. Full production ID for this design was droid.probe.ordmantellrecon_a01. Basic design included five multi-purpose manipulators. It allowed to install wide array of weapons, protective shileds and extra equipment.
Many droids of this model were used at the factory for repairs and ventilation maintenance, but like many other models, their programming was damaged during the Sacking of Coruscant

Sacking of Coruscant Event Great Galactic War (3681BBY - 3653BBY)

, and they went rogue.