This heavy duty unpainted but treated bird nest box is approx. 12 inches high x 6 inches deep x 6 inches wide and made form solid pine for long life.
It is perfect for blue, coal and marsh tits and are in accordance with RSPB recommendation the bottom of the entrance hole is 125 mm from the floor of the nest-box. If it's less, young birds might fall out or be scooped out by a cat. The bottom board can be removed each Autumn for cleaning.