車刀，5/16" HSS 螺紋，兩件組

Used one for a quick internal threading job on some steel, and the pre-sharpened 55-degree end cut cleanly with almost no cleanup. Happy I have a 60-degree end ready for the next project without needing to swap tools.

Sharpened both ends at 55 and 60 degrees, which saved me a lot of setup time on my lathe. They cut clean threads on a stainless steel bolt without chipping. Exactly what I needed for an internal threading repair job.

Had a couple of small jobs cutting 60° internal threads, and the pre-sharpened tip saved me the hassle of grinding my own. The 55° end is still untouched, but the steel held up fine on some mild steel stock.