Just a sawhorse. Modelled with actual dimensions. Low poly but with bevelled edges. No nails or fasteners.
I like things like these; Detail and clutter/litter objects that can help flesh out a scene. Even something as simple as this saves a few minutes to append it rather than finding references and modeling it. Sometimes it's not even a matter of saving modeling time, but inspiration; This has me thinking of several other items I might not have thought of if I hadn't seen this.