Gravity well projector

"That's because this isn't a tractor beam. It's a gravity well.'

A gravity well projector was a powerful device typically affixed to an Immobilizer 418 cruiser, used to pull ships out of hyperspace. As a ship could not usually enter hyperspace when within a planet's gravitational pull, the gravity well projector mimicked the effect to trap others.

Five years after the birth of the Empire, an untested Immobilizer 418 cruiser was used to trap Wilhuff Tarkin's stolen corvette Carrion Spike. However, at the time the gravity well projectors were not perfected, and the Immobilizer was returned for reassessment.

Fifteen years after the birth of the Empire, an Immobilizer 418 cruiser utilised its' four gravity wells to trap and destroy a Rebel patrol. It also succeeded in capturing Ezra Bridger and Commander Sato aboard the corvette Phoenix Home, but subsequent action led to its' destruction.