Sandleford brick insert letterboxes are manufatured to suit standard Australian brick sizes. Brand new in package. 350mm Brickies White Letterbox set includes: Fixed front, rear opening with Telescopic sleeve. Aluminium construction , powder coated finish. Key lockable ( keys included) Fits into 1.5 brick wide, 2 brick high cavity Suits A4 mail and documents. Easily fitted to brick/rendered walls, fences and pillars.