shankpiece
/ˈʃæŋkˌpis/
noun
- A part of a tool or machine that connects the working end to the handle or motor, especially on a drill bit or similar implement.
- The shankpiece of the chisel was worn from years of use.
- He replaced the shankpiece of the screwdriver to fit the new handle.
- The drill bit's shankpiece snapped under too much pressure.