Nature House DH12N 12 Room Hex House 2 Story Martin House Provide a comfortable home for purple martins Each apartment measures 8 inches wide at the front, 2 inches wide at the back, 6.5 inches deep, and 6 inches tall Each room has a 2.125 inch diameter entrance hole and the metal lip at the end of the porch protects young birds from falling Use the included metal door stops to seal the house and prevent aggressive squatter birds from taking over your colony House's design promotes a higher occupancy rate and such a design prevents domination fights between males