The 360 3 inch Universal Clamp allows you to fine tune your tower speakers rear-facing direction. You won&';t have to "come close" any longer, just set it where you want and lock it down! EACH SOLD SEPARATLY Includes: 1.9", 2.375", and 3" plastic inserts Compatible with most Roswell Tower Speakers External set screws allow for 360deg rotational mounting positions Saltwater friendly