It is a standard product for upholstery or sofa industry in North America. It is used to connect the sofa or upholstery by end user. The end user can add the single sofa to to make a long sofa as many as the end user wants. Upholstery manufacturer also can ship the long sofa in small pieces and put these together at destination to save the shipping cost. The plastic jaw can be truned down after it is mounted under seat and then turned horizontal to combine another soaf. The material of plastic jaw is high quality Nylon filled with Glass-Fiber. The Plastic Jaw Assembly and Tri-post can be sold seperately.