Which type of nail is designed with two heads for easy removal?

Duplex nails are specifically designed with two heads, which facilitates their easy removal. This design makes them ideal for temporary constructions or situations where a project may need to be disassembled or adjusted. The presence of two heads allows for a hammer to grip and pull the nail out without damaging the surrounding material, ensuring a clean removal process.

In contrast, ring shank nails have a corrugated shaft designed for enhanced holding power, while common nails are typically used for permanent fastening and do not have features tailored for easy extraction. Finishing nails, being smaller with a slender head, are intended for aesthetic applications and are often driven in below the surface, making them more difficult to remove cleanly. Thus, duplex nails stand out for their unique design that meets the specific need for easy disassembly.