The hyperdrive ring, alternatively named a hyperspace transport ring, functioned as a mechanism that enabled hyperspace travel for starfighters lacking an internal hyperdrive. Examples of such fighters include the Delta-7, the 7B Aethersprite-class light interceptors, and the V-19 Torrent starfighter. A specific example of a transport ring was the Syliure-31 hyperspace docking ring.
Darth Vader's own V-wing squadron employed hyperspace rings while chasing after weapon thieves affiliated with Cham Syndulla's Free Ryloth Movement.
In the New Republic Era, Morgan Elsbeth's forces built the Eye of Sion, a hyperdrive ring prototype significantly larger than a standard ring. According to architect droid Huyang, it possessed the power necessary to undertake extragalactic voyages, with the goal of rescuing Grand Admiral Thrawn from his exile.