The 7670 Hailfire Droid and Spider Droid is a Lego® Star Wars set that was released in 2008. This set contained the minifigures of two Battle Droids, a Commander Droid and a Super Battle Droid. It also included a Hailfire Droid and a Dwarf Spider Droid. The set was originally released in January 2008 with the Expanded Universe packing, but the set was later re-released with the Clone Wars packing. The Hailfire Droid includes treads that attach to it and Flick Fire Missiles.
Picture of the set