Clean Wood Treatment: the use of untreated and breathable wood ensures balanced temperature conditions inside the nest box The LEVIATAN TURDUS nest box is species-appropriate with a half-open entrance, called a half-cavity. Black redstarts, gray wagtails, pied flycatchers, robins and winter wrens will delight in this comfortable nesting aid Solid natural wood, thickness about 2cm, large inner surface Dimensions: Interior dimensions of the bottom: 11 × 11 cm The height of the entrance opening is 5 cm The boards are 2 cm thick Width 15 cm Length 15 cm Total height 32 cm The method for connecting a staple of 40 mm Colour: naturally heated wood