We have a wide variety of ER11 and ER20 collets for woodworking.
These collets have a .0004" / ..01mm runout and are available in many sizes.
Since using these i have less tool marks and super clean cuts
Replaced the stock collet on my Makita Router. Bit stays put and no drops. Did a 3 hour carve using 3 bits with no issues. Releases bit after carve reliably.