Hardware components known as fasteners are used to mechanically connect or fasten two or more items together. Fasteners occur in a variety of shapes, sizes, materials, and finishes, and include screws, nails, nuts, bolts, washers, and other specialist parts. Fasteners are vital components in a variety of applications, including construction, manufacturing, and maintenance. They can be used to join things composed of wood, metal, plastic, or other materials.