BLACK 12" DUAL PORTED SUB BOX, FITS SIERRA EXT & CREW-CAB 2019-2024 SPECIFICATIONS: -CUTOUT DIAMETER: 11 1/8" - AIR VOLUME: 0.90 FT3 -WEIGHT: 26 LBS. -MOUNTING DEPTH: 6 1/2" DIMENSIONS: -FRONT HEIGHT: 9 1/2” -REAR HEIGHT: 6 1/2" -LENGTH: 25 1/2" -TOP DEPTH: 17" -BOTTOM DEPTH:15” CONSTRUCTION: -5/8" MDF WOOD -GLUE -STAPLES +MAINLY SEALED WITH HIGH QUALITY SILICONE+ INSTALLATION: -FITS UNDER REAR SEAT -DOWN FIRING NOT ALL SUBS WILL FIT DUE TO THE CUTOUT DIAMETER OR MOUNTING DEPTH SO PLEASE CHECK THE DIMENSIONS TO MAKE SURE THIS BOX SUITS YOUR SUBS