Check the listing for details. Birdhouse Floor Riser 2-pack. Condition: New. Listed at 17.95 USD. Package of 2 PVC coated galvanized steel nest lifts for use inside of bird houses. Elevate nests above the floor, keep the nest dry, allow waste to fall clear of the nest and prevent infestations of blowfly larvae that can kill nestlings. Designed to specifications from the North American Bluebird Society, these Nest Lifts are made of galvanized steel and coated with black PVC for durability, ease of cleaning, and safety. Bluebirds need every advantage. This is a simple and effective way to keep them safer and healthier. Simply insert into your existing bird house and your birds will thank you! Dimensions:5"D x 3.5"W x 0.75"H Material:Galvanized Steel coated with black PVC Customizations happily made. Just send me a note. Please check out my complete collection of bird feeders, houses and accessories in my shop.