Enhance your door's functionality with this letterbox featuring an internal draught excluder. It has integrated brushes to block draughts and an internal water seal to prevent leaks, keeping your home comfortable and dry. The anti-snap flap opens a full 180 degrees for easy access and reduced risk of damage. With an adjustable sleeve, this letterbox fits doors 20mm to 39mm thick, making it suitable for most uPVC, composite, and timber doors. The 10" (27cm) length ensures a good fit. Please ensure you check the size and fit before purchase, as letterboxes come in 10" or 12" sizes and suit different door depths. This model is 10" (27cm) and fits doors 40–80mm thick. Measure your current letterbox and door depth carefully for compatibility. The external and internal flaps open up to 180 degrees without risk of snapping. The telescopic design allows adjustment for doors between 20mm to 40mm thick. The overall size is 270mm x 70mm, with internal sleeve dimensions of 225mm x 37mm. The distance between screw holes is 245mm. Installation is easy with adjustable sleeves for uPVC panel doors ranging from 20-40mm thickness; use the provided short or long screws depending on your door thickness. The integrated brushes prevent draughts, and the internal water seal stops water ingress.