Anti-Roll Bar or Sway Bar

Sway bar has other names as anti-roll bar or stabilizer bar and is present in automobile suspension. The purpose of a sway bar is to keep the body roll of the vehicle at low level during a sharp turn.

Anti-sway bar or shock broken.

I believe usuallly it is a High Carbon Steel such as 1080 - 1095 or 5160 series steels

The links go on the end on the sway bar and hook to the suspension. Bushings are used to connect the sway bar to cars frame.