Carmex Single Threading Insert holder - For Carbide External/Internal Threading Inserts - SR0021H21Our industry leading assortment of indexable thread milling tools can be used with a wide range of applications. These tools were created in order to machine threading jobs on CNC milling machines (by using helical interpolation programs). They allow for improved productivity, thanks to the increased cutting speeds, and multi tooth carbide inserts. Additionally, they can be used to lower tooling costs as they are considerably cheaper than comparable