An anti-gravity unit was a vehicle-mounted device used for loading and unloading of heavy cargo. Anti-grav loaders were known to be equipped with them. The unit worked by shooting an anti-gravity beam at heavy objects, apparently making them weightless, and then guiding them to their desired destination. It could apparently be used as a combat countermeasure as well, as Kirk Windjammer once used his anti-grav unit to deflect an incoming photon missile.