Application guide: Proper installation is very important to ensure the design load will be reached in the application. Yida strongly recommends that the installation and site quality check be done according to the guidelines and dimensions. Site installation method: 1.Screw the bolt into female coupler swaged with rebar, till unable to screw continually. 2.Screw another side of bolt into the other sleeve after swaged with rebar, till unable to screw continually. 3.With help of two pipe wrench, tighten the connection by turning both rebar couplers in opposite direction at the same time.