Full Crew Cab Models Only! Includes storage box and attachment system (dividers not included). Perfect solution for keeping your valuables stored away and out of sight; Great for tools, sports gear, winter accessories, hunting and fishing equipment and more. Compatible with Chevrolet/GMC Silverado/Sierra 1500 2019-2022, 2500HD/3500HD 2020-2022 Crew Cab (does not fit 2019 1500 LD, does not fit 2019 Limited, does not fit Double Cab). Easy tool-free installation and removal with quick release attachment points. Attachment system is engineered to be superior; It is very strong yet easy to put on and off so you can remove your box if you need to. No fumbling and fighting like with other systems. Tough high impact molded heavy duty automotive grade black plastic (resistant to most chemicals); Does not interfere with foot well area; Large storage capacity: Approximately 54-1/2" wide x 16-1/4" deep (custom designed to only fit Crew Cab models)