Constructed of heavy-duty diamond tread aluminum the Buyers Aluminum Gull-Wing Cross Box Full Size is designed for use with trucks that have 6.5- or 8-foot beds. This box mounts easily to the side rails of your pickup with no drilling required; simply use the included hardware and J-hooks. Installation causes the box to be suspended from the rails allowing for clearance and extra storage underneath.This tool box features two gull-wing style lids that provide easy access to what’s inside from either side of the truck. Each lid has a one-touch push-button rotary locking mechanism and two gas shocks per lid for safe operation. Inside a removable storage tray with dividers keeps tools of various sizes organized.The Buyers Aluminum Gull-Wing Cross Box Full Size comes in your choice of lengths and heights. Please measure your truck bed to ensure the correct fit.Size Details71L x 20W x 18H inches= fits full-size pickup with 6.5- or 8-foot bed71L x 20W x 23H inches= fits full-size pickup with 6.5- or 8-foot bed71L x 27W x 18H inches= fits full-size pickup with 6.5- or 8-foot bed71L x 27W x 23H inches= fits full-size pickup with 6.5- or 8-foot bed with slant