Come from a  retired dental office, change/hold burs well,looks no broken parts, other than these, don't know the function and I have no way to test them, they sold as is, non-return, so please don't ask.

SN：as picture show

FDA Disclaimer:

The sale of this item may be subject to regulation by the U.S. Food and Drug Administration and state and local regulatory agencies. If so, do not bid on this item unless you are an authorized purchaser. If the item is subject to FDA regulation, I will verify your status as an authorized purchaser of this item before shipping the item