If you need the added comfort of security for your door letterbox, this may be what you are looking for.
These letterbox security cowls will fit over most existing openings and even letterbox tidies. However please check measurements against your existing opening.
Please also note that fitting the security cowl may impede some post getting through your letterbox because it restricts the angle.
Suitable for apertures up to 310mm x 80mm
Actual Cowl dimensions: 344mm x 78mm
Comes with fitting instructions