Carlisle’s HP-X Fasteners are used with PIRANHA Fastening Plates to secure mechanically fastened Sure-Weld® TPO and Sure-Flex™ PVC roofing systems to 20- and 22-gauge steel decks or minimum 15⁄32″ CDX plywood decks. HP-X Fasteners are #15 steel-threaded fasteners that offer excellent driving and pull-out performance and outstanding resistance to back-out and corrosion. They are packaged and sold 1000 plates per pail. Each pail weighs 53 lbs.