An Anti-Backlash Gear is a gear having minimum or no backlash (lash or play). Anti-backlash capabilities can be applied to many types of gears, and is most commonly seen in spur gears, bevel gears and miter gears, and worm gears. Sometimes backlash is favorable and a necessary part of the way gears work, but in many situations it is desirable to have little or no backlash. This maintains positional accuracy, which is key in applications where items need to be mechanically lined up.