Nikcole SG-0.8-R .031"/0.8mm TIN Coated Right Hand Grooving Insert. Mini grooving system.

I purchased several of these. The quality was OK. One insert was a little narrower at the cutting edge than the others which required me to adjust my CNC program to compensate. That's why I didn't rate them "5"

This is a nice complement to the standard "set" on the market which skips a few available sizes including this one.