Insert, 1/64" Groover HSS

I needed a consistent groove depth for a repair, and this insert cut a clean, precise line without any chatter. The steel feels durable, and it seated perfectly in the tool holder.

The 1/64" width is dead-on and the T-15 steel holds an edge through a surprising number of passes. Cuts those tiny external grooves without chatter, even at the full quarter-inch depth.

Finally an insert that cuts clean, true 0.015" grooves without chattering on the first pass. The T-15 steel holds an edge longer than I expected on stainless, and the 0.25" depth is plenty for most of the retaining ring jobs I do.