Solid aluminum alloy clamps attach to Bazooka MT-8002B and MT-8002W Tubbie wakeboard speaker systems, allowing you to mount the speaker enclosures onto wakeboard tower bars. Marine-grade plating protects them from the elements. Spacers are included to allow you to mount your Tubbies on 1-7/8", 2", 2-1/4", or 2-1/2" size bars. Two clamps are included in the package.