Pit Droids
Pit droids are handy little mechanic droids particularly well-designed for the podracing circuit (or any other number of jobs where speed is of the essence). They are programmed to do everything with the utmost urgency, and have minimal logic processors so they don't waste time asking personal or superflous questions (like many models of droid). Although easily confused and prone to getting into trouble if not constantly given fresh orders, pit droids are nevertheless invaluable for their strength, speed, and small size (a definite benefit inside the workings of many devices, such as engines). Their dome-shaped heads protect them from falling tools and parts, and they have high-torque motors built into their heavy-construction joints to make them capable of great strength. Pit droids also have antennas that enable them to coordinate in groups, as long as one unit is the designated leader and able to dedicate itself fully to the task of wrangling the other droids.
Pit droids are easily stored and recharged because they are fully collapsible. The "nose" on the droid's head is actually its on/off switch.
Although pit droids are common on the podrace circuit, one can also find them elsewhere...frontier outposts, spaceports, junkyards...anywhere that a speedy and innocuous little mechanic can come in handy. Many smugglers and tramp freighter captains keep a pit droid or two in the equipment locker for emergencies.