Which tool would be least effective for fastening wood to metal?

The finishing nail is typically used for attaching thin pieces of wood, such as trim or molding, and is designed to hold wood components together effectively. However, it is not well-suited for fastening wood to metal because it lacks the necessary grip and strength to securely bond those two different materials. The small diameter and short length of finishing nails make them more appropriate for wood-to-wood connections, where they can be easily driven into the material and hold firmly.

When considering fastening wood to metal, options like flathead wood screws and flathead stove bolts are much more effective because they are designed specifically for such applications. Wood screws have a thread that can grip the wood securely while penetrating metal, and stove bolts provide a strong fastening option with a nut that can secure the assembly.

The flaring tool is unrelated to fastening wood to metal, as it is primarily used for shaping or bending metal tubing. Thus, its application does not pertain to the task of joining wood to metal.