I have a 1960's steel siding. They work, but not all along the side seam. Photo #1 shows how my siding has nails in various places along the seam where the seam is too narrow to insert. However, there are many places where these nails are not present, so there is enough space to insert. The sign in photo #2 weighs approximately 4 pounds. Overall I am happy with the performance of the product and that it matched my siding.
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