This is a belt clip that will allow covertech wheels on your saber to attach into it securely so you can wear your saber on your belt.
Some sabers come with a covertech wheel pre-attached, such as the Phantom Warden. Otherwise you can purchase our covertech wheel attachment that will attach to your saber between the pommel and the handle.
Both the covertech wheel attachment and belt clip also come in a bundle to save a few dollars, so grab that if you need both.