Ball center for use in all RockJock "narrow" 2" Johnny Joint® rod ends with the 1 piece bushing features a .5625" thru bolt hole (for use with a 14mm bolt) and is a 1.600" wide mounting width. Ball is CNC machined steel and heat treated for extremely long life. For use as a rebuild part or for those building up their own arms and joints. We use this center in our CE-9112N and CE-9112N-L forged narrow rod ends that are used in our CE-9120FJK and CE-9120RJK front and rear Johnny Joint® trac bars for the '07 and up Jeep JK.