Roswell 360 3″Universal Clamp The Roswell 3″ universal clamp is designed to allow you to fine tune your tower speakers rear-facing direction. External set screws allow for full 360 rotational mounting positions to let you set it where you want and lock it down. Product Features: Sandblasted Clear Anodized Finish Saltwater Friendly 360 Rotational Mounting 1.9″, 2.375″, 3″ Plastic Inserts Included