There are three separate objects.
The wheel, the single lug-nut, and the tire.
The download includes the basic geometry and
materials. The chrome was done in Blender's ray-tracer. For the .obj, .fbx, and .lwo you'll have to apply your own ray-tracing or texture. The base mesh is shown in wire frame.
The .blend uses subdivision surfaces. The .obj, .fbx, and the .lwo will need these to be applied by you in your application. Just use a low setting.