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A set of 12 door stops for round holes.
Use these to close up your purple martin house in the off-season to keep undesirable species from becoming entrenched during winter. Will also keep bluebirds and tree swallows from taking over house before purple martins return. Do not remove until martins are seen or known to be in the area.
WDS12 fits all Trio round entrance houses.
Trio houses include the popular Grandma and Grandpa houses, Musselman, MSS and M12K and Castle Systems.