Center floor tray for MSS12R House.  Allows Martin Nests to dry and allows the addition of Martin House Protector or DE under nests to reduce insect infestation. Allows approximately 1/4" air space between the nest and floor. This Floor Tray fits the the center compartments in the MSS12R Martin House. (4 required per house). MINIMUM ORDER - 2 Pieces. Made in USA.