Description of HHIP Inch Piece Boring 1001 0001: Superior Precision and Performance for Boring Operations
A Shank Dia. (In) 3/8 | Set PC. 9. Shanks are made of special heat treated alloy steel. | Three lengths for each minimum bore size. Quality tool designed to be used as a boring tool bit. All shanks are held to 0.000 - 0.0005" from the nominal size. Grade C-6 for all types of steel and general purpose.
Very pleased with the quality of these boring bars. Ultra-sharp and well-protected cutting edges during transport. I use it on wood and soft metals, but they'll probably be good on steel too.
I missed the return deadline by 5 days, never assume the product is as advertised. The first set of carbide tipped boring bars I bought lasted for years if sharpened on a diamond wheel from time to time. I didn't know there was such a thing as "soft" carbide. These carbide tips (if carbide) wear out in just a few cuts and feel as soft as the mild steel I'm cutting.
Pros
Mark C-6 for all steel grades and general purposes.