Our 500 x 500mm Letterbox Installation Slab is the reliable foundation used for free-standing letterboxes, including pillar-style and sandstone models. The slab is buried just below ground level during installation, providing a level and stable base without interrupting your landscape design. For added durability, pillar letterboxes are fixed to the slab using industrial-grade adhesive to ensure they remain upright and secure over time.

• Dimensions: 500mm (W) x 500mm (D) x 35mm (H)
• Texture: Smooth Finish
• Colour: Grey
• Material: Reinforced concrete (suitable for outdoor use)

• Purpose-built for pillar and sandstone letterbox installations
• Buried just below surface level – remains mostly unseen
• Fixed using strong industrial-grade adhesive for a lasting hold
• Prevents tilting or sinking on grass, soil, or garden beds
• Smooth finish allows for clean adhesion and quick installation