You can use the easy-to-install Metal Predator Guard to prevent squirrels, mice and woodpeckers from chewing/drilling and enlarging the opening on any nestbox with an existing hole.
FEATURES:
- 1.5" Portal for Bluebird House
- 1.25" Portal for Nuthatch House
- 1.125" Chickadee Portal
- 1" Diameter Wren Portal
- Outer size is 2"x 2"
- Galvanized Steel
- Powder-coated tan finish
- PH1; PH2; PH3; PH4