Through research, testing and engineering S-5! has been a leading manufacturer of on metal roof attachments for over 25 years. They provide the largest selection of of metal roof attachments for solar PV arrays; they virtually have a mounting solution for every metal roof. S-5! products have been installed on over 1.9 million metal roofs. All of S-5! clamps and brackets are made in the USA, and come with a 25-year manufacturers warranty.