Tried and true, Fiberon ArmorGuard Hidden Fasteners ensure lasting hold in a traditional metal fastener design. Made from stainless steel with corrosion-resistant coating More "teeth" and sharper curves grip deck boards for a stronger hold to the joist Keyhole design properly orients and seats the screw for optimal installation Butt Joint Fasteners eliminate the need to double joist or use two fasteners at joints Start/Stop Fasteners eliminate surface fasteners on the beginning and end boards of the deck Line Fasteners work with interior deck boards Start/Stop Fasteners work with perimeter boards