General description House sparrows nest colonially, so up to three pairs may be attracted to and nest in the Sparrow Terrace Nest Box. This versatile box can be configured into three separate boxes or different shapes depending on the wall's shape or your preference. You can also expand your terrace by purchasing additional House Sparrow Nest Boxes to fit onto the end of the sparrow terrace. Technical specifications Material: Exterior Grade Plywood Construction: Panels stapled together with surface sunk staples Finish: Non-toxic water-based stain and preservative Dimensions: Overall height: 24 cm, Overall width: 39 cm, Overall depth: 17 cm Weight: 2.4 kg Entrance hole diameter: 32 mm Installation The box features concealed keyholes at the back for easy fitting, allowing it to be mounted right up at the eaves where sparrows prefer to nest. A screwdriver can easily reach the keyholes through the entrance holes. Usage Each box has a slide-out floor with drainage holes for easy cleaning