Knife ruiner?
https://www.aldi.co.uk/ferrex-wet-sharpener/p/021111303380400
That was my first thought as soon as I saw the picture.
Isn't that a grinder and hone, so you would need to know what you are doing.
@rhb started
London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
JurekB
lynx
@rhb
Knife ruiner?
https://www.aldi.co.uk/ferrex-wet-sharpener/p/021111303380400