Snow safe - thanks to this protection, can no longer chop the entrance hole larger to get access to the young birds Flight hole adjustment - thanks to this protective plate with protected design, the diameter of the flight hole can be adjusted for other bird species Easy to install - with the 6 included galvanised screws, the installation of the sheet is done within a few minutes - the aluminium sheet is weather- and very due to the natural oxide layer. Colour: Silver Material: Aluminum Package Contents: 2 x Heart-shaped birdhouse protection plate (28mm orifice plate x 1+32mm orifice plate x 1) 6 x screws Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.