Which term refers to the plastic or metal component that is nailed onto outside corners of drywall for a finished look?

The term that accurately describes the plastic or metal component nailed onto outside corners of drywall to provide a finished look is "Corner Bead." This component serves a vital purpose in both protecting the edges of the drywall and enhancing the overall aesthetic of the corner. By creating a crisp and clean finish, corner bead helps to ensure that corners are not only structurally sound but also visually appealing. It can be installed in various forms, including metal or vinyl, depending on the intended design and durability requirements.

The other terms do not specifically refer to this drywall component. A corner cap typically refers to a covering for a corner or edge to improve aesthetics but is not used in drywall applications. A corner guard usually pertains to a protective covering that guards against damage in high-traffic areas, while corner trim refers to decorative moldings that can enhance the appearance of corner areas but are not specifically the component used during the drywall installation process.