Insert, TDEX-21.5 Carbide

For a 60° triangle with that 15° relief, it seats nicely in the tool holder without any wobble, and the TiN coating’s got a nice gold sheen that makes it easy to spot on the bench. The single countersink hole lined up perfectly with my pin, and it’s handled a few interrupted cuts so far without chip

The 60° triangle with 15° relief fit my holder perfectly, and the TiN coating is holding up well after several hours of turning steel. No chip breaker, so I have to manage stringers manually, but for the price these cut clean and true.

Bought these for my boring bar to touch up some 4140 and the TiN coating is holding up way better than the uncoated ones I was burning through. The 15° relief gives me enough clearance in tight bores without rubbing. No chip breaker, so I have to manage my feed, but for the price these cut clean.