STEP 1 Attach the eight wall brackets to wall. There are two holes in each bracket, which are used for screw connections to wall. Make sure the bracket distances from each other are correct, depending on the screen size. Make sure the heels of both screws fit into the slots of wall bracket, enabling the wall slide to position properly. Next, attach the wall slides to the screw holes of wall brackets as shown in the picture. Tighten the cap screws securely with an L-wrench. After this tighten the wall sockets securely onto wall slides and make sure the heels of each socket comes in contact with the slides. When the full installation of screen has been done, It is still possible to lower or raise the each slide with a socket to set the system horizontally even.NOTE The wall mounting screws are not included. Please consult a professional installer if you do NOT know an appropriate way to attach heavy loads to your wall material.