Bar stool with a seat height of 24 inches (610 mm). The total chair height is 34 inches (915 mm).

There are 4 copies of the model saved in the scene, each with its own customized material, a total of 4 colors.
On the model, the Turbosmooth modifier is assigned in the Render Iterations = 1 mode, which is applied during rendering, in the viewport on the model, anti-aliasing is not applied to facilitate the viewport.
In the obj file, the model is saved with the applied Turbosmooth.

Model weight without Turbosmooth: 78361 polygons, 79192 vertexes.

All objects in the scene have unique names.
All materials have unique names.

The pivot point of the chairs is aligned with the center and bottom of the chair.

The chairs are fully expanded on the soft part and legs, except for rivets.

Who works in V-Ray version lower than 3.1, be careful, in the materials in the BRDF section there is Microfaset GTR (GGX), if your version is older than 3.1, then the BRDF field will be empty. Choose Blinn, Phong or Ward - which is preferable for you.

For Corona render, it is recommended to install a version not lower than 1.5, since the glossiness of the materials is adjusted taking into account PBR.