What is used to fasten wood or metal to metal using a screwdriver or wrench?

The correct answer is the roundhead stove bolt because it is specifically designed for fastening materials together, particularly metal to metal or wood to metal, and can be operated using a screwdriver or a wrench. These bolts have a rounded head which allows them to sit flush against the surface of the material being fastened, providing a secure fit and a neat appearance.

This type of bolt is typically used in applications where a strong and stable connection is required, making it suitable for a variety of construction and repair tasks. The combination of the bolt and a nut ensures that once tightened, the connection remains intact and can bear significant loads.

In contrast, a hex screw, while also useful for fastening, generally requires a hex wrench rather than a screwdriver. A wood screw is designed specifically for use with wood materials and has features suited for gripping into wood, which may not offer the same fastening capabilities in metal applications. A machine screw, although useful for fastening metal parts, often requires a tapped hole and is typically paired with a nut rather than being used with a screwdriver alone like the roundhead stove bolt can be.