DOC-SNB(22 3/4 x 21 1/4 x 22 1/2 ) DOC-FNB(22 3/4 x 41 3/4 x 43 1/2 ) Unique diamond design comes assembled in a box Choose 4 hole or single hole design15 x 15 Nest box openings to accommodate almost any kind of poultry. Perch is included and easily attached by sliding in under egg roll out guard. 8 egg roll out guard helps hold bedding and keep eggs secure in box. Nest box stand is included to help prevent rodents underneath and keep eggs on the sides self standing Able to be hung from peak of box to suspend if so desired Diamond design prevents roosting and manure build up on roof. Offset roost keeps birds and nest box cleaner from manure.