NATIONAL NAIL 53285 12-Inch Bright Spike Nails - Heavy Duty Construction Nails for Fencing, Decking & Outdoor Projects

Exactly what it says. If you don't normally buy this kind of stuff, be aware that "bright" means that this product is not galvanized or protected from rusting in any way and is made of plain, bright steel. So these will definitely rust if used outdoors or in a damp environment. Also realize that these are heavy spikes, and 5 pounds comes out to 13 nails per package.