Snow safe – this protection prevents the entrance hole from being enlarged, ensuring young birds remain secure Flight hole adjustment – the protective plate design allows the flight hole diameter to be adjusted for different bird species Easy to install – with 6 included galvanized screws, the aluminum sheet can be installed in minutes Weather-resistant – the aluminum sheet is durable and protected by a natural oxide layer Color: Silver Material: Aluminum Package Contents: 2 x Heart-shaped birdhouse protection plates (1 x 28mm orifice plate + 1 x 32mm orifice plate), 6 x screws Note: The package includes only the items listed above; other products are not included Note: Light reflection and different displays may cause slight color variations between the image and the actual item Measurement allowance: +/- 1-3 cm