Series 60 Description: A "water shedding" flat lock shingle style panel system. Diamond or rectangular shaped shingles are available in many colors, finishes and natural metals. A wide range of sizes are available, however, the most economical sizes will be factored by the raw material size itself. The 2 or 3MM thickness of the composite material offers superior flatness over solid metal shingles. It must be installed over a nailable substrate with an appropriate weather barrier.