Deckfast Metal - Brown (#34) - 350 pc. Deck Pack - 1-5/8" Self Drill - Type 410 Stainless Steel Deck Fastener for Use With Metal Joists & Trex Elevations Designed to attach every type of decking to steel and aluminum substructures. Perfect for PVC, composite, capstock and hardwood decking. Triple strength corrosion protection 410 Stainless Steel + Zinc Plating + Epoxy Coating #3 Drill point with wings is designed to attach decking to both 18 & 14 gauge steel joists. DECKFAST Metal is approved for use Trex Elevation steel deck framing.