JCs Wildlife Green Recycled Poly Wren Portal Cover/Birdhouse Predator Guard DETER PREDATORS FROM YOUR BIRD HOUSE: 1/2 inch thick poly lumber deters and slow downs predators from your bird house ECONOMICAL: Eco-Friendly recycled poly lumber is guaranteed not to crack, split, or fade in the elements 1/8 INCH HOLE: 1/8 inch hole diameter is perfect for Chickadee and House Wren birdhouses CHARMING DESIGN: Charming bird design and vibrant color adds whimsy to any birdhouse GUARANTEED: Guaranteed not to crack, split, or fade! Will add protection for your feathered friends season after season.