Nails – small metal fasteners with a flat head – typically driven into wood by a hammer, ideal for applications when joining two surfaces together or serving as a hanging point for light objects. Ideal for concrete forming and scaffolding, duplex nails have smooth, uncoated shanks and double heads for ease of removal. For use in concrete, block and wood, the masonry nail is a medium-duty fastener that provides a strong hold with ease of removal.