Chevy Avalanche Black Diamond Speaker Box Midgate Replace Subwoofer EnclosureCustom fit for the Chevy Avalanche Black Diamond Edition Box will look like the first 2 pictures Box is sprayed with truck bed liner in the back as in picture 2. Box can be carpeted in the back for $100 less 12" sealed design shown above Hole cutout: 11. 125" (11 1 8) Custom hole cutouts by request Box constructed of 3 4" MDF, glued and nailed Can be made sealed 8", 10", 15" hole optional upon request. Round or Square About 2. 5 cuft of total airspace