• Maguard letterbox security cover by Magman - 45 degree opening restrictor prevents key fishing and theft, brass spray coated steel
  • Installing Maguard letterbox security cover internally with four screw mounting points on wood door
  • 45 degree letterbox restrictor angle - allows post delivery while preventing hands and tools from reaching through letterbox
  • 45 degree letterbox restrictor angle - allows post delivery while preventing hands and tools from reaching through letterbox
  • White letterbox restrictor on a white background with 'Metro' and 'The Sunday Times' logos.
  • Black metal letterbox restrictor on a white background with logos at the top.
  • Metal letterbox restrictor on a white background with a brand logo at the top.
  • Spray coated steel construction on Maguard anti-theft letterbox guard - tamper resistant security cover in different finishes on a white background with Magman logo.
  • A message from our founders. We have developed all of our products from scratch using our hands, brains and life experience. We pay our workers fairly and keep our customers at the centre of every decision. Our products are meticulously developed, with quality service and a customer-first approach as our foundation. We are broadening our selection of unique, high-quality products and appreciate all customer support. Thank you from Nick and Lou, father and son, a family business for over 10 years. As seen i
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Maguard® Letterbox Security Cover

Maguard® Letterbox Security Cover

Color: Black
£20.50 GBP
£20.50 GBP
Sale Sold out
Taxes included. Free UK delivery. International delivery calculated at checkout.

Will it fit your door?

  • Letterbox: fits behind standard UK letterboxes up to 374 × 85mm
  • Space needed: 60mm depth behind the door; works with Magflap and standard gravity flaps
  • Fixings: four screws, chosen to suit your door thickness

Free UK delivery (3 working days) or Express £4 (1–2 working days). Dispatched within 1–2 working days. Free 30-day returns.

Not sure? Email a photo of your letterbox to info@magman.uk and we'll tell you what you need.

Will it fit? Specs, fitting & add-ons

✅ Designed to Deter Attacks – Blocks access through the letterbox flap to prevent key fishing, tool insertion, or wire manipulation attempts

✅ Compatible With All Magflap® Models – Seamlessly mounts over or alongside your existing Magflap® MK3

✅ Ultra-Strong Steel Construction – Hardened, powder-coated steel resists tampering and forced entry

✅ Tamper-Resistant Fastenings – Secure internal fixings make removal from the outside virtually impossible

✅ Minimal Visual Impact – Low-profile, blacked-out design preserves the door's appearance

✅ No Interference With Door Operation – Fitted internally without affecting open/close function

✅ Easy DIY or Installer Fit – Can be fitted in under 10 minutes with the included guide

✅ Ideal for Street-Facing Properties – Extra security layer for vulnerable or exposed front doors

✅ Built in the UK – Precision-manufactured by Magman® for quality, security, and reliability

  • Est 2009
  • Free Returns
  • Fast Postage
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EASY USE

Versatile Installation

Can be fitted internally or externally, offering flexibility for various door types. Can be fitted by you or a trusted installer, see our guide below.

Fitting Guide

Proven Thermal Technology

The magnetic seal keeps warm air in and cold draughts out, all year round.

FUSS FREE

Brushless Design

All of our products are brushless. Our perfectly balanced Magman strength magnets eliminates the need for bristles, ensuring a smoother, longer-lasting performance.

The Iconic

Magman® Seal

A strong magnetic seal ensures no gaps for air to seep through, preventing draughts all year round.

Carefully crafted since 2009

Family Owned

Our mission is to restore the brilliance of British craftsmanship.

About Magman

1 Year Warranty

Not only does our product come with a 1 year warranty, if you move house and remove your Magflap you can send it back to us to be refurbished ready to install at your new home.

Proudly

Made in the UK

Proudly manufactured to the highest standards of quality — not just in our products but our service too.

Eco Friendly

Cork Gaskets

Made with cork gaskets to reduce plastic use and provide a more eco-friendly solution.