PROXXON 28940 metric collet set
Proxxon 28940 provides six nominal metric collet sizes from 1.0 to 3.2 mm.

How to choose
Check the exact tool model and choose the collet marked for the bit’s shank. This set is relevant if you use several shaft sizes within that supported system.
Compatibility and limits
Six metric steel collets in a holder · verify MICROMOT fit
Questions before buying
When does the steel collet set make more sense than the 28941 chuck?
Choose the collet that matches a known shank when the manufacturer specifies it for your tool. Compare the 28941 range if you switch between sizes and your tool is in its supported model list.