Description: Mounting powerful 4-inch KICKER speakers for external listening in marine and powersport applications just got easier with KICKER's durable and weather-proof KM-Series Tower-Speaker Empty Enclosures. Options Includes acoustic poly-fill for clearest sound and all mounting hardware including rubber adapter inserts for use with the most popular tower round-tubing diameters: 7/8", 1", 1-1/8", 1-1/4", and square 1". Also compatible with 1-1/2" round tubing without rubber inserts. Bold With its bold cosmetics, the white high gloss KM enclosures with contrasting accent details complement KICKER's 4-inch coaxial marine speakers. Aim to Please Designed with a 360-degree axis rotation in either direction, allowing the speaker cans to be aimed in the most desirable location to deliver maximum sound quality. Specifications: Speaker Fitting: 4" Speakers Materials: Tough ABS, weather-proof Aiming: Nine-degree axis rotation in either direction for aiming maximum sound quality Fits Mounting Tube Sizes: Utilizing included rubber inserts: 7/8", 1", 1-1/8", 1-1/4", and square 1". Also compatible with 1-1/2" round tubing without rubber inserts. Connectors: Via wiring harness Includes: Mounting hardware and polyfill