The StarPort Adaptor is the fundamental mount for all of the RAILBLAZA Accessories. The StarPort Adaptor allows you to attach it to any item you want to make it StarPort compatible, thus maximizing your StarPort system. The washers provided give your accessory the ability to swivel 360 degrees. The Adaptor is only available in black and is sold in quantities of two. As always, this complete kit comes with stainless steel hardware. StarPort Base not included.