Abstract: A two-piece lid for closure of a container neck with a thread or undercut shoulder having a lid member formed of a metal and a separate safety ring formed of synthetic material. The ring has an upper part and lower part, with the upper part positioned inside a sidewall protrusion which is provided at the lower edge of the lid member. In order to make the safety ring undamageable, the ring can be shrinkable in its lower part. On the other hand, the upper part of the safety ring can be formed as an outwardly directed edge and the lower part can be formed as an inwardly obliquely directed lip, so that the ring has a substantially Z-shaped cross-section. In both cases, there are no parts protruding over the protrusion of the lid member, where the ring could be damage unintentionally.