DETERS PREDATORS: Deters or Slows Down Predators from Entering Bird HousesDIMENSION SIZE: 1.5 inch portal hole is the perfect size for Bluebirds and Carolina WrensEXCLUSIVE: Made exclusively by JCs Wildlife in Southern IndianaECONOMICAL: Made from recycled poly lumber which is guaranteed not to crack, peel, or fadeUNIVERSAL: Fits over the entrance portal on your existing birdhouse or nesting boxJCs Wildlife exclusive bird house predator guard. Made of recycled blue poly lumber, for any existing birdhouses without a predator guard. Comes with two screws. Made in the USA Hole dimension 1.5" in diameter Total dimensions for the protector: 2.75" H X 4" W X .5" D *Includes portal cover only*