The product family has three types of couplers, including upset forging parallel thread couplers (for 12~40 mm rebar), bolt couplers (for 12~40 mm rebar), and male and female couplers (for 16~36 mm rebar). All products in the product family can be used for steel rebar. In high-rise buildings, bridges and other large-scale structural projects, the studied products are used to connect reinforcing steel in reinforced concrete structures, simplifying the construction process. The products are sold inside of China and over 50 countries.