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These tunnels come with round entrances to be mounted onto wooden houses.
The tunnel offers additional safety by increasing the compartment depth to keep nestlings at a further distance from predators.
Can be mounted with screws or nuts and bolts (not included).
Existing house entrance should be enlarged to minimize birds getting trapped between entrances
NOTE:
Photo shown has Conley 2 entrance (TTCOL) this item has a round entrance.