Hi Sambo,
I can't remember the actual brand of my nutsert tool. Also nutsert seems to more of an industry term..try using 'threaded insert'.
I've also just done a quick search on the RS webpage and found this one.
RS Australia Threaded Insert Toolkit
There are quite a few variations but they all achieve the same outcome. My kit came with the attachments to do 4, 5 and 6mm threaded inserts. An 8mm insert would also be useful.
All the best,
Luke......
