Weatherproof Speaker Housing - Black - 4" Designed with a 360-degree axis rotation delivers sound in any direction, Slatted mounting holes for a variety of bolt patters, Fits frame tube sizes 2-1/4", 2-3/8", 2-1/2", 2-5/8", Also compatible with 1-1/2" round tubing without rubber inserts., Mounting hardware and polyfill included