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A casing nail is a type of wire nail used for finish work. It is characterized by a small, slightly flared head.1

Nails, in general, are slender metal shafts with a pointed end and a flattened head, used to fasten materials, most commonly wood. While common nails have large heads driven flush with the surface, finishing nails have smaller heads that are set below the surface. Casing nails are similar to finishing nails but have a slightly thicker shaft and a cone-shaped head, making them suitable for interior paneling and cabinetwork where a neat appearance is desired.2

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