Owl Guard for MSS12R, M12K and old style MSS12. Secures with 4 Stainless Steel Spring Clips per Panel (2-Panels). Exclusive spring clip allows for quick installation and removal. Nest checks have never been easier. The marine grade, lobster trap mesh features 2"x2" openings. It's fully galvanized and then vinyl coated to prevent feather wear. The spring clips are made of stainless steel. OG1N protects against great-horned owl, fish crow and hawk attacks. New, recently upgraded! This guard now features 6 Enlarged entrance ports per panel. Each enlarged port is over 2-1/4" in diameter to ensure effortless access. Super easy to install.