nail, in construction and carpentry, a slender metal shaft that is pointed at one end and flattened at the other end and is used for fastening one or more objects to each other.
Nails are usually made of steel but can also be made of stainless steel, iron, copper, aluminum, or bronze.
Stainless steel is your best bet for avoiding rust
Nails intended for outdoor use are often galvanized or “hot-dipped” with a coating of zinc to improve their weather-resistance.
Stainless steel is also used for outdoor applications, though stainless steel nails are considerably more expensive than zinc-plated nails.
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