Abstract: In a tamper-evident screw-threaded closure of the kind in which the skirt of a cap is joined at its lower edge to a band by integral elongated breakable webs the webs are associated with co-operating teeth and notches that drive the band during the screwing-on step, the web extending from the root of the tooth to the adjacent wall of the notch in an inclined direction such as to flex or pivot and allow relative movement between the cap and band during this step without breaking, and the band has lugs which oppose circumferential, rather than axial, movement in the unscrewing direction.