Rockville is proud to introduce our all new line of aluminum wakeboard cans. The MAC80-BLUE comes in pairs and includes our rugged universal aluminum clamp for easy installation to any wakeboard tower pole measuring from 2" to 2.5" diameter. Six precision molded high impact rubber inserts guarantee fitment on towers from 2â to 2.5â. Our clamp inserts are precision-fitted to sit perfectly inside the metal clamps. The speaker terminals are safely enclosed inside the waterproof speaker canister.