Hole Protector for Birds Nesting Box. Stop attack from other animals, mamals & birds, the hole protector will stop them from clawing or gnawing the soft wood hole and entering the nesting box. IV, HS, KA27-28, KW, PA20-49, PA60-78, PH17-26, PH30-44, PH49-50, ZE & BT.
eBay