DS18 HYDRO TMBRX/BK Tube Mounting Bracket Clamp Adaptor for all NXL-X and CF-X Towers – Black (Single) Our ultra loud DS18 X series wakeboard towers come with a standard size tower clamp that fits most applications, but for those that do not have a tubular tower need another option. The TRMBX attaches just like the standard clamps to the base of the speaker tower, but now gives you a mount option that can be mounted to any tubular or flat surface that has proper support. These super strong clamps are sure to give your DS18 X series towers a sturdy and stable base for tower or non tower applications