Are you using a large TV as your display or have multiple displays stacked vertically, and want to be able to use the Lucky Duck Tech Webcam Mount for video calls? The 5" or 12" inch extensions allow you to position your webcam in the center of your large display or the bottom display, in a stacked configuration. They will position your webcam up to a maximum of 9" and 16" (240 and 400mm) respectively from the top of your monitor. String as many of these extenders together, as required, to get the right position for your webcam.