Pulling your wire.....

[Justdroppedin]

https://thumbs.gfycat.com/SparseDetailedAardwolf-size_restricted.gif

[Gates07]

that has to be a very strong magnet, good idea

[Terryl]

A very old idea, as my Dad used a metal beaded chain(like the pull chains on some lights, but stronger) to blind fish wires (pull string/rope first) through walls, he had a good magnet way back then also.(1940's) I still use this method today as needed to pull coax through a interior wall or behind a floor to ceiling cabinent.

[dishuser]

I use a shop vac and string

[Terryl]

Good idea for long or short conduit runs.