SnoBlox Deuce 150pc Snow Guards & Screws Kit for Metal Steel Corrugated Roof Can be mounted with adhesive or screws. Fits most popular 36" metal panels with three 12" flats or four 9" flats without rib straddling! Starter points are provided for mechanically fastening. ATI lab tests show 3,456lbs strength with mechanical attachment. Free layout at www.SpacingTool.com