His speaker clamps halves touch when they are tightened. While this looks nice, it does not allow you to tighten to your tower tubing. I had all my speaker housings rotating and finally drilled and tapped the mounts and my tower to eliminate the movement. If you use those mounts (epecially for wakeboard racks with a lot of force on them), figure how you are going to prevent them from slipping (either with a pin or drilling and tapping for a bolt).
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