What carbide insert is this

[Silverbullet]

The anvil is there to back up the cutting tool. It gives a flat and strong surface for the carbide. Steel backed carbides allow the steel to heat up and deform the holder. It helps to stop the carbide from braking.

 

[darkzero]

The anvil is there to back up the cutting tool. It gives a flat and strong surface for the carbide. Steel backed carbides allow the steel to heat up and deform the holder. It helps to stop the carbide from braking.

Good point, although that may be true on larger turning tool holders for heavier turning with shanks larger than 3/4". The anvils on a laydown threading tool is mainly for setting helix angles. Threading tools aren't subject to heavy turning.

 

[Ulma Doctor]

Threading tools aren't subject to heavy turning.

Maybe that's my problem