Can anybody tell me what this is for?

[kess]

Hi Moby Duck,

It is angle grinder base (for 115~125mm models),
for convert and use them like a chop saw.
I have one similar but I have use it, only two times.
The correct setup it's pain and fiddly each time that you will need it,
and if you haven't a second angle grinder to burying on it,
I would not recommend you buying it.

Regards
Bill

[Moby Duck]

Thank you Kess, your advice is appreciated and as it has missing parts I will be taking your advice and will not buy it.
Thanks to everybody that has helped me identify this.
My problem is solved.
Case closed.