This is ER20 High Quality Collet with 3.5mm Hole.
- Made from Alloy spring steel and fully hardened.
- All critical collet surfaces are precision ground for accurate fit.
- Works in all ER20 Collet Chucks.
- ER16 collet has a full 3.5mm range of collapse while maintaining full accuracy.
- ER16 collet has a range : 3.0mm to 3.5mm.