set in cement
Firmly or permanently established; not subject to change; unalterable. The healthcare law looks promising, but we'll have to wait until it's set in cement before we know exactly what it will do.
in cement
Firmly settled or determined; unalterable. For example, Their policy on taxes was set in cement despite opposition. For a synonym, see cast in stone.
in cement
Firmly settled or determined; unalterable: The administration's position on taxes was set in cement despite the unfavorable public response.