Each really should do the job. You'll likely really have to sharpen far more often with HSS. But, I built about a dozen blanks for bezels from 40mm bar, turning operate was with carbide, but applied HSS for parting off, and bought all twelve parted with out sharpening the Slash https://tudor53859.atualblog.com/41175736/details-fiction-and-audemars-piguet