Mirelurk cage

The mirelurk cage is a constructible item added to Fallout 4 by the Wasteland Workshop add-on.

Characteristics
A large-sized cage, the mirelurk cage will, when powered, capture and hold mirelurks and variations thereof. Mirelurk cages are baited with mirelurk eggs to lure the creatures into the trap.

Upon release, the mirelurk occupant immediately becomes hostile to the player character and any settlers unless a Beta wave emitter is present and active upon the creature's release. With the emitter active, captured mirelurks will not be hostile and they will actually provide defense for the settlement against incoming hostiles.

Crafting

 * Steel (16)
 * Copper (4)
 * Gears (4)
 * Mirelurk eggs (4)

For full details, please see: the "Cages" section of Fallout 4 Settlements