Metlok 700® is a concealed fix roof & wall system that allows for thermal expansion and contraction of sheets making it ideal for long run applications. Manufactured from 0.42mm and 0.48mm BMT COLORBOND® and ZINCALUME® steels, Metlok 700® is suitable for use in commercial and industrial applications for roof pitches as low as 1 degree (1 in 50).