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These "H" sign channels hold thick materials, either 1/8” or 1/4” thick. Permanent peel-and-stick foam tape mounts signs securely to vertical surfaces. Use one 1/8" or 1/4" Sign Channel at the top and another at the bottom, with this 1/8” or 1/4” "H" channel in the middle, to securely mount two signs, one above the other.