fer·rule
\ˈfer-əl, ˈfe-rəl\
noun
1 : a ring or cap usually of metal put around a slender shaft (as a cane or a tool handle) to strengthen it or prevent splitting
2 : a usually metal sleeve used especially for joining or binding one part to another (as pipe sections or the bristles and handle of a brush)
http://www.merriam-webster.com/dictionar...

fer·rule (frl)
n.
1. A metal ring or cap placed around a pole or shaft for reinforcement or to prevent splitting.
2. A bushing used to secure a pipe joint.
http://www.thefreedictionary.com/ferrule

fer·rule (fer′əl, -o̵̅o̅l′)
noun
a metal ring or cap put around the end of a cane, tool handle, etc. to prevent splitting or to give added strength
Mech. a short tube or bushing for tightening a joint
http://www.yourdictionary.com/ferrule

Ferrule
Definition: The plastic ring or cover over the hosel at the point where the shaft enters the clubhead.
http://golf.about.com/cs/golfterms/g/bld...