Carlisle's HP-X Fastener is a specialized, high performance fastener designed to secure Carlisle single-ply membrane and insulation. The HP-X Fastener can be used on steel decks (20-gauge (0.91 mm) or 22-gauge (0.76 mm) or wood (minimum 15/32" (12 mm) CDX plywood). The HP-X Fastener is designed to offer an optimum combination of driving performance, back-out, and corrosion resistance with excellent pull-out performance.