These sockets are for people that like to switch switches with the changing of the tides. The PCB that you intend to use these with needs to have the proper connections for them.
The MX socket will work with any Cherry MX compatible switch. The Choc socket on the other hand only works with Kailh's low profile Choc switches.
Sold in packs of 10.
I just got them for a xmas present for someone else so they have yet to actually be used but everything came in the high quality way that they do. I look forward to getting a package from MKultra because of the packaging.
Kailh Hotswap Sockets