Profile: Threads for the South, Inc. is a provider of fasteners and industrial products. Our fastener products include anchors, metric fasteners, rivets and US fasteners. The anchor bolt is an L shaped bolt with an angled hook that is typically cast in concrete. It is commonly used for fabrication and construction applications such as in columns, floor plates & sign structures. The drive pin anchor, also known as nylon nail or nylon nail-it anchor, is a hardened steel nail embedded in a cylindrical nylon base. It is available in round and flat styles.