Keep several of your S&K purple martin houses or barns usable with help from these S&K Starling Resistant Door Panels for PBH-12 and BN-16 Martin Houses. This set of 4 lengthy, white plastic panels makes it easy to keep your existing home looking like new, while discouraging starlings from nesting. Each piece has 3, crescent shaped entries along the bottom, flanked with rustic shutter accents for a fun look. Tabs at the end of each panel insert easily into the walls of your existing S&K Purple Martin Barn or S&K Purple Martin House, and the bottom of each snaps into place for a secure closure. Dual ventilation holes above each entry, along with the white color of these doors, help regulate the nest temperature and prevent overheating. The slight outward extension in the center of each segment adds a bit more room to each martin compartment, and this package of 4 panels is great for a full shelter or several homes in your established colony. Easily replace broken panels on select, existing S&K martin homes with these Starling Resistant Door Panels for PBH-12 and BN-16 Martin Houses. Made in the USA. This case pack contains 4 of the S&K Starling Resistant Door Panels for PBH-12 and BN-16 Martin Houses. Openings: 3"W x 1.125"H Dimensions: 18.5"L x 0.5"D x 6.125"H each Mounting: attach to existing S&K Purple Martin House or Barn Construction: plastic