Here's a link to an Ebay item that is the BXA size. Not cheap, but still the best price I've seen for a quality Dorian tool.
Ebay item
You would want the single ended insert style blade from the maker of your choice. I love having the double ended one on the left in my photo, it's only 1.5mm (.059") wide and is ideal for small diameter stuff. The single ended one on the right in my photo is a wider 4mm insert, good for heavier duty parting operations. I have other monoblock tools in 2.5mm, 3mm and up to 1/4" wide. That's only because I get on a kick every now & then and buy a bunch of tools to eat up any profit I may have made in the shop.
Ebay item
You would want the single ended insert style blade from the maker of your choice. I love having the double ended one on the left in my photo, it's only 1.5mm (.059") wide and is ideal for small diameter stuff. The single ended one on the right in my photo is a wider 4mm insert, good for heavier duty parting operations. I have other monoblock tools in 2.5mm, 3mm and up to 1/4" wide. That's only because I get on a kick every now & then and buy a bunch of tools to eat up any profit I may have made in the shop.