Bluebird Box House Woodworker's Vise Livestock Milk Replacer with Probiotics Water Heater Insulation Jacket Livestock Milk Replacer with Probiotics An all milk protein formula with a blend of vitamins Constructed with rust free hardware and stainless steel screwsPole or flush mountWater based protective stainExclusive 3 year warrantyDimensions: 12”H x 5 1 2”W x 8 1 8”D Weight: 2lbs 13ozAttracts: Bluebirds Durable rust free galvanized wire meshPredator guard extends entrance hole to protect against predatorsPredator guard entry hole has a diameter of 1 1 2" Predator guard with an entry hole 1 9 16" in diameter for Western bluebirds can be purchased separately on the Replacement Parts page and retrofit to the bluebird houseBluebird house body has an entry hole with a diameter of 1 9 16" to allow it to be used for both types of bluebirdsFledgling kerfs provide extra grip for fledglings to climb out