This is a kit of the main component for the GM3SEK technical article and videos for cleaning up your main power for your shack.  Like this one from M7EUP.
 
The kit compises of 
1 x Mains filter Schaffner FN2030A-16-06
1 x Large Fair-Rite clamp on core 0431177081
2 x Fair-Rite oval core 2643167851
1 x Plastic box CE-TEK GR17012
2 x plastic cable glands, 5-10mm size
2 x 1 meter of 3 core 16amp flexible main cable
 
We do not supply mains extension leads, spade connectors or connection blocks.  These are readily avalable items and most radio amateurs have then roaming around the shack.
 
When built this kit may help with mains based RFI into your shack.
 
Please note do your research online for this kit.  It involves some simple DIY; however with mains voltage.  So we will not be responsible for your build.