Threaded nails, also known as SCREWS, are a type of fastener used to join two or more pieces of material together. They consist of a cylindrical shaft with a helical groove, or thread, running along its length. The thread allows the nail to be inserted into a pre-drilled hole and then twisted to secure the pieces together. Threaded nails are commonly used in construction, furniture making, and other applications where a strong, secure connection is needed.