ER20 Collet nut (Type-A Balanced)

 
These high quality ER20 collet nuts have been precisely balanced for optimal performance and serve as a replacement for lost ones, they can be handy to have a few spare so you can click in a collet of a particular size and swap both the collets and nuts in one go as required.
 
**Please choose your thread pitch very carefully to avoid puchasing the incorrect pitch.**