An insidious weapon unveiled by the Separatist Alliance during the later stages of the Clone Wars, buzz droids are tenacious saboteurs launched onto enemy starfighters via specialized missiles. When the missile achieves an optimum proximity to its target, it fragments to unleash a cloud of melon-sized metal spheres into the target's flight path. The spheres attach themselves to a target vessel, popping open to reveal an insect-like droid equipped with cutters and other tools of vandalism.
The buzz droids are designed to disable, not destroy, enemy craft. They operate quickly, slicing into starship hulls and severing vital control linkages. While their tools are effective, they are relatively weak and vulnerable to damage. A hit to its central eye can knock a buzz droid out of commission.
R2-D2 tangled with buzz droids several times during the Clone Wars. He sparred with the relentless wreckers when they swarmed Anakin Skywalker's Jedi starfighter over Cato Neimoidia, and later over Coruscant.
Jedi starfighters are the ideal target for buzz droids, since the small size of the fighter craft makes it easy for the droids to swarm over its surface.
During a Separatist plot to destroy a Republic military conference in the Carida system, they commandeered a Jedi cruiser and used buzz droids to seek out any infiltrators who could thwart this plan.
D-Squad member M5-BZ bravely sacrificed himself to save his fellow droids from an infestation of buzz droids by ejecting them into the vacuum of hyperspace.
Vulture droids can carry specialized missiles filled with compressed buzz droids for deployment during combat.