#10210 WOOD PREDATOR GUARD Provides protection by doubling the depth of the entrance hole. Makes it more diffcult for predators to get to the eggs or squirrels to enlarge the hole. Available in sizes: 1", 1-1/8", 1-1/4", 1-1/2", 1-9/16" 2", 2-1/4", 2-1/2" and 3" in diameter. Specify bird house and/or diameter needed when ordering.