Mamba GaGa locking hubs are are an optional means to help prevent hinge pins from being removed from the panels. They are inserted in the top hinge and are tightened with a hex key, creating friction to "lock" the hinge pin in place until the locking hub is loosened. PLEASE TAKE CARE TO NOT OVER-TIGHTEN! Doing so can damage the panels and make removal difficult. Please call 855-626-2242 for assistance.