Dimensional Shackles is a rare wondrous items in D&D 5e. It does not require attunement.
Wondrous item, rare
You can use an action to place these shackles on an incapacitated creature. The shackles adjust to fit a creature of Small to Large size. In addition to serving as mundane manacles, the shackles prevent a creature bound by them from using any method of extradimensional movement, including teleportation or travel to a different plane of existence. They don't prevent the creature from passing through an interdimensional portal.
You and any creature you designate when you use the shackles can use an action to remove them. Once every 30 days, the bound creature can make a DC 30 Strength (Athletics) check. On a success, the creature breaks free and destroys the shackles.
Frequently Asked Questions
You can use an action to place these shackles on an incapacitated creature.
The Dimensional Shackles is a Rare magic item in D&D 5th Edition.
The Dimensional Shackles is a Wondrous Items — Wondrous item, rare.
No, the Dimensional Shackles does not require attunement and can be used immediately when held or worn.