Compatible with Chevrolet/GMC Silverado/Sierra 1500/2500/3500 1999-2006 (& 2007 Classic Models) Extended Cab only (Excluding models with 5'8" bed length) High impact molded automotive grade black plastic, tough enough for long-lasting performance. Anti-skid surface to minimize cargo shifting. The storage box brings more storage space to the car, and the rational use of space makes the mood more pleasant. Plus, avoid the embarrassment of a cluttered floor when you have passengers in the back seat, protect your belongings and keep your belongings away from people's feet and out of sight of thieves Package Including: 1x Under Seat Storage Box+ necessary mounting hardware as picture shown. Installation instructions are NOT included!!! Two-way wire lock and wire mounting. Professional installation is always highly recommended.