Abstract: A pressure or draw bar of fiber-reinforced insulating material, in particular for a high voltage circuit breaker. The pressure or draw bars of fiber-reinforced insulating material are provided with connecting elements for the introduction of force for operating the circuit breaker. The connecting apertures of the draw bar which allow connection to the circuit breaker should be simple to adjust and secure, but should be fixable in a manner which permits ready detachment. The connecting apertures of the connecting elements are arranged in a fork part, to which a slit pipe part with external threads lies adjacent. In the slit pipe part a spreading body is arranged held by a screw, which in the region of the fork part has a surface accessible for generating a rotational motion. The spreading body can thus by spreading apart the slit pipe part determine the height of the connecting apertures with respect to the bar. The fitting body is surrounded on the outside by a ring as screening.