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Letterbox Blanking Plates - Letterblox™

5 out of 5 stars
£107.99 inc VAT
£89.99 ex VAT
Product Overview

Letterbox blanking plates protect letterboxes against arson and vandalism while premises are unoccupied, eg during holidays or in between tenants in the case of let properties. Our easily fitted and removed blanking plates work with most letterbox apertures. Constructed from solid steel they are secured in place by internally accessed handwheels. Letterblox™ lockable letterplate coverings are an insurance requirement for rented properties when they are left unoccupied.

  • Protects property from vandalism and arson attack while unoccupied
  • Designed to fit the majority of door types and letter plate openings
  • No tools or fixings required for installation
  • 2 year manufacturer's warranty
  • Tested to BS EN 13724
  • Received the 'Secured by Design' award
  • Ideal for use on unoccupied properties
  • Re-usable so can be used again and again

Please note: The uPVC door is for illustration purposes only.


The Letterblox™ Kit has been designed to fit most letterbox apertures. Contents list:

  • External Steel Plate
  • Internal Steel Plate
  • 2 x 30mm Handwheels
  • 2 x 50mm Handwheels
  • 2 x 70mm Handwheels
  • 6 x Spacing Washers
  • Foam Gasket
  • Sizing Gauge
  • Magnetic Letterblox Sign
  • Instruction Sheet
  • Ziplock Bag
Installation Instructions

Installation Step 1

Carefully remove your existing letter plate from the door you wish to fit the Letterblox to. Place your removed letter plate and all fixings into the supplied ziplock bag to ensure all components are kept together and are easily accessible should you wish to refit your original letter plate in the future.

Installation Step 2

Use the supplied sizing gauge to determine the thickness of your door and select the corresponding components from the Letterblox kit to ensure that a secure fit can be achieved.

Installation Step 3

Place the exterior plate into the external letterbox aperture (so the protruding section is facing inwards). The foam gasket can then be fitted over the protruding section as this will help to hold the plate in place when fitting the interior plate.

Installation Step 4

Place the interior plate over the internal letterbox opening and connect both plates using the knobs and spacers selected in Step 2. Loosely screw the handwheels into place so that both plates are held together.

Installation Step 5

Ensure the Letterblox™ is straight and tighten the knobs to ensure that both plates are fixed against the door and are providing a secure seal. If the fitment is too loose / tight, try a different combination of handwheels / spacers until the desired fitment is achieved.

Technical Data
Brand Letterblox
Dimensions (HxWxD)

External Plate: 70x330x3mm (Excluding Connector Bar)

External Plate with Bar: 70x330x23mm (Including Connector Bar)

Internal Plate: 70x330x3mm


Main Body: Steel Plates

Fixings: Plastic / Foam / Steel Bolts

Weight 3.00kg

Key Product Features

Supplied with ziplock bag for safe storage of original letterplate

Supplied with foam gasket to avoid damage to the letterbox aperture

Supplied with 3 pairs of knobs with different lengths

Supplied with sizing guide to indicate which knobs to use

What's Included?

Every Letterblox DERLTRBLOX is supplied with the following components.

  • External Steel Plate
  • Internal Steel Plate
  • 6 x Spacing Washers
  • Letterblox Sign
  • Instruction Sheet
  • Ziplock Bag
  • 2 x 30mm Knobs
  • 2 x 50mm Knobs
  • 2 x 70mm Knobs
  • Foam Gasket
  • Sizing Gauge

Pricing & Availability

Model Stock Price
Product Code: DERLTRBLOX Stock Level:
5 in stock Expected dispatch: Today

£107.99 inc VAT

£89.99 ex VAT

Delivery Options

The following delivery options are available on this product.

Economy Delivery

£4.99 inc VAT - Orders will be delivered in 3-5 working days with Evri by Hermes

Express Delivery

£8.10 inc VAT - Orders will be delivered in 1-2 working days with Evri by Hermes

Excellent Warranty

This product is supplied with a 2 year manufacturers warranty as standard

Customer Reviews

1 customer has given this product an overall rating of 5 out of 5

Reviews by real customers

All of our product reviews are written by real customers that have purchased this product from us and are published without modification.

Rating: 5 / 5 Stars

Reviewed by: M S

So easy to install 5 minutes no fixings or door holes needed, smooth smart firm fixing. Great item for peace of mind nothing will be getting through that .

Published on: 13th November 2021

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