HY-C 2525 Galvanized Steel Mesh Spark Arrestor/Bird and Squirrel Screen, 13" x 13" Keeps small animals such as birds and squirrels out of the chimney No tools needed to install; simply slip the heavy corner fins down into the flue tile Made from heavy-duty 16 gauge 5/8" galvanized steel mesh Painted black to resist oxidation Made in the USA