36 inch long X 18 inch x 18 inch aluminum underbody tool box. Two or three things to note: 1. One end is damaged but it is still functional, it still closes and locks 2. It is a UNDERBODY box for use UNDER a flat deck or body. NOT designed to be used in the back of a pick up truck box. Just saying...... 3. If you are so inclined it can probably can be made to look better if you have the necessary skills.