Abstract: This invention deals with the problem of premature functioning of shells with point detonating fuzes. A diffuser is provided in a fuze head to prevent a direct impact on the detonator by providing an effective cover to all elements of the detonator. This is done by providing the fuze head with a twisted flat, rectangular plate, which is substantially rigid for protection against, solid objects, the build-up of a large volume of rain and inhibit direct impact of such material upon the detonator.