---
product_id: 423778598
title: "12\" (30.6cm) Sleeved Letter Box - For 40-80mm Door Thickness, Anti-Snap Flap, Internal Draught Excluder, Adjustable Letterbox for UPVC Composite Wood Doors (Silver/Polished Silver)"
brand: "keypak"
price: "€ 42.33"
currency: EUR
in_stock: true
url: https://www.desertcart.hr/products/423778598-12-30-6cm-sleeved-letter-box-for-40-80mm-door
store_origin: HR
region: Croatia
---

# Adjustable fit 40-80mm doors Anti-snap flap 180° open Internal draught excluder & water seal 12" (30.6cm) Sleeved Letter Box - For 40-80mm Door Thickness, Anti-Snap Flap, Internal Draught Excluder, Adjustable Letterbox for UPVC Composite Wood Doors (Silver/Polished Silver)

**Brand:** keypak
**Price:** € 42.33
**Availability:** ✅ In Stock

## Summary

> 📬 Elevate your entryway with style and security—don’t let your door miss out!

## Quick Answers

- **What is this?** 12" (30.6cm) Sleeved Letter Box - For 40-80mm Door Thickness, Anti-Snap Flap, Internal Draught Excluder, Adjustable Letterbox for UPVC Composite Wood Doors (Silver/Polished Silver) by keypak
- **How much does it cost?** € 42.33 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/423778598-12-30-6cm-sleeved-letter-box-for-40-80mm-door)

## Best For

- keypak enthusiasts

## Why This Product

- Trusted keypak brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Weather Warrior:** Integrated internal draught excluder brushes and water seal keep your home cozy and dry by blocking drafts and moisture intrusion.
- • **Snap-Proof Access:** Innovative anti-snap flap opens a full 180°, preventing damage and providing effortless mail retrieval without the worry of breakage.
- • **Hassle-Free Upgrade:** Comes with all necessary bolts and a straightforward installation guide—upgrade your door’s functionality and style in minutes.
- • **Durability Meets Design:** Robust aluminium construction with a polished silver finish that elevates your door’s aesthetic while resisting wear and tear.
- • **Perfect Fit, Every Time:** Telescopic sleeve adapts seamlessly to door thickness from 40 to 80mm, ensuring a flawless installation on UPVC, composite, or timber doors.

## Overview

The Keypak 12" Sleeved Letter Box is a sleek, adjustable letterbox designed for doors 40-80mm thick. Featuring a durable aluminium build with a polished silver finish, it includes an anti-snap flap that opens 180° for easy access, plus an internal draught excluder and water seal to protect your home from weather. Easy to install with included hardware, it fits most UPVC, composite, and timber doors, combining modern functionality with classic style.

## Description

12" (30.6cm) Sleeved Letter Box - For 40-80mm Door Thickness, Anti-Snap Flap, Internal Draught Excluder, Adjustable Letterbox for UPVC Composite Wood Doors (Silver/Polished Silver)

## Features

- CHECK SIZE & FIT BEFORE PURCHASE – Letterboxes come in 10" or 12" sizes and suit different door depths. This model is 12" (30.6cm) and fits doors 40–80mm thick only. Some doors may also have slimline letterboxes, which are longer and narrower. Please measure your current letterbox and door depth carefully to ensure compatibility.
- ANTI-SNAP FLAP – The flap opens a full 180 degree for easy access and to prevent it from snapping off when opened too far.
- ADJUSTABLE SLEEVE – The telescopic design means the letter box can be adjusted to fit doors between 40mm to 80mm in thickness. Our letter box will fit most uPVC, Composite & Timber doors.
- DIMENSIONS – The letter box overall size is 306mm x 70mm and the internal dimension of the sleeve is 254mm x 37mm. The distance between the screw hole centres is 280mm. Suitable for apertures between 285mm x 50mm up to 295m x 60mm.
- INTERNAL DRAUGHT EXCLUDER – The integrated brushes help prevent draughts. Plus, an internal water seal prevents water leaks as it stops water getting into the door or panel.
- EASY TO INSTALL – Please read product description below for a simple guide on how to install the letterbox.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Keypak |
| Part Number | B56212-35EL |
| Product Dimensions | 6.7 x 30.6 x 7 cm; 470 g |
| Item model number | B56212-35EL |
| Size | 40-80mm |
| Colour | Silver/Polished Silver |
| Style | Classic |
| Finish | Polished, Oil Rubbed |
| Material | Aluminium |
| Item Package Quantity | 1 |
| Number of Pieces | 1 |
| Plug profile | Door Mount |
| Included Components | 2 Short Bolts, Letterbox, 2 Long Bolts |
| Batteries included? | No |
| Batteries Required? | No |
| Item Weight | 470 g |

## Images

![12" (30.6cm) Sleeved Letter Box - For 40-80mm Door Thickness, Anti-Snap Flap, Internal Draught Excluder, Adjustable Letterbox for UPVC Composite Wood Doors (Silver/Polished Silver) - Image 1](https://m.media-amazon.com/images/I/61GE4cMwsvL.jpg)

## Available Options

This product comes in different **Colour Name, Size Name** options.

## Frequently Bought Together

- Keypak 12" (30.6cm) Sleeved Letter Box - for 40-80mm Door Thickness, Anti-Snap Flap, Internal Draught Excluder, Adjustable Letterbox for UPVC Composite Wood Doors (Silver/Polished Silver)
- UPVC Door Handles Set - Polished Chrome - Lever/Lever - 92mm PZ (Centres) - 122mm Screw to Screw - Backplate 212mm X 34mm - UPVC Door Handle - Polished Chrome Replacement Handles - PVC Door Handle
- XFORT Door Knocker Polished Chrome, Victorian Urn Door Knockers for Front Door, Elegant Front Door Furniture with a Classic Period Design

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.hr/products/423778598-12-30-6cm-sleeved-letter-box-for-40-80mm-door](https://www.desertcart.hr/products/423778598-12-30-6cm-sleeved-letter-box-for-40-80mm-door)

---

*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-03-20*