What is this part (that binds multiple wires) called and how do I remove it?

[dddddddddt]

DIY'er here with quite basic electrical knowledge, stuck at this

What is this silver-colored part (that binds multiple wires) called and how do I remove it?

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Image IMG-0114 hosted in ImgBB

ibb.co

Thank you! ?

 

[telectrix]

looks like lead, so can easily be cut off . either that or cut the conductors.

 

[DPG]

Make sure the power is isolated if that's a mains voltage connection.

 

[Marvo]

It's some type of crimped ferrule that makes a permanent connection.

As above make sure it's not live and cut it off. If you need to make a connection again use a Wago connector or an equivalent.