Rockville Dual 12" Sub Box for GM/Chevy 2007-2013 1500 Crew Cab 2500HD/3500HD Rockville Dual 12" Sub Box for GM/Chevy 2007-2013 1500 Crew Cab 2500HD/3500HD Proudly Made In The USA, Using Only The Finest Quality Materials - For The Best Level of Performance From Your Subs! 5/8" USA Heavy Duty MDF Construction and Machine precision cut mounting holes Machine precision cut mounting holes. Top of the line Glue for extra durable adhesion, High quality spring loaded terminals Designed, tested, and engineered to work with most of todays popular woofers. These enclosures are built with the quality additives needed to maximize the performance of any sound system. Rockville Dual 12&#034; Sub Box for GM/Chevy 2007-2013 1500 Crew Cab 2500HD/3500HD Proudly Made In The USA, Using Only The Finest Quality Materials - For The Best Level of Performance From Your Subs! 5/8&#034; USA Heavy Duty MDF Construction Machine precision cut mounting holes Top of the line Glue for extra durable adhesion High quality spring loaded terminals Designed, tested, and engineered to work with most of todays popular woofers. These enclosures are built with the quality additives needed to maximize the performance of any sound system. Type of Enclosure: Sealed Enclosure Sub Size: Dual 12&#034; Dimensions in Inches: 9&#034; L x 50.75&#034; W x 16 H&#034; Mounting Depth: 5.5 (inches) Mounting diameter (hole size): 11 (inches) Wood thickness: 5/8 (inch) Air space: 0.9 Cubic feet Material: Highest-grade MDF wood on the market