The OMG Batten Bar is designed to secure single-ply membrane to steel, wood, concrete, gypsum, and cementitious decks. The appropriate OMG fastener should be used when fastening into the substrate. OMG Batten Bars are made of Galvalume® coated steel except the Polymer Batten Bar, which is made of corrosion-free modified polymer. It comes with Pre-punched for enhanced speed of installation.