Heavy Duty Seam Plates are specifically designed to be used for the attachment of Elevate thermoplastic membranes to approved substrates. Elevate Heavy Duty Seam Plates are to be used with Elevate Heavy Duty or All-Purpose Fasteners into steel, wood or structural concrete decks (Heavy Duty Fasteners only). They may also be used with Elevate Purlin Fasteners to attach membrane to structural steel purlins. The plates are packaged in a clear plastic sleeve for easy handling. The sleeve has an easy-open pull tab with serrations that runs the length of the sleeve.