45KMTC8 8" Marine Coaxial Tower System Sweet Swivel A revolutionary 359-degree swivel clamp lets you aim your music anywhere anytime with no tools required. The stainless-steel clamp automatically adapts to tube sizes ranging from 1-1/2 to 3-1/4 inches vertically or horizontally while the through-clamp wiring and integrated speaker/LED connectors create a clean look without binding posts.