Kicker 4 Weatherproof Speaker Housing Easily install powerful 4-inch Kicker speakers in marine and powersport applications with Kicker's KM-Series Tower-Speaker Empty Enclosures. These enduring and weather-proof enclosures simplify the mounting process. Features: Sold in pairs 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 Compatible with 1-1/2 round tubing without rubber inserts 360-degree axis rotation in either direction Black high gloss enclosure 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