Smittybuilt. 44 inch by 39 inch. Give or take . Older model. I have had it on several jeeps, a 4Runner, and a pick up camper shell. I usually fabricate mounting to suit my needs quite easily, but I still have the originals. Sturdy, strong, and in very good shape. Similar to haul master from harbor freight (at $100), but better. Has always worked well. I have had quite a bit of weight on it and off roaded it. It has never bent or flexed. (Until that time I hit something and then just bent it back!). It’s been collecting dust in the backyard while I was wishing I needed it again. Time to send it on to a new home.