Metal stackable chair without armrests.

The model is made according to the size and photo of the manufacturer:
https://www.ckitchen.com/p/flash-furniture-xu-ch-10318-arm-sil-gg-nash-sta.html 

There are 3 copies of the model in the scene, each with its own customized material assigned.

Sizes:
Height 83.2cm (32.7in)
width 57.7 cm (22.7in)
depth 56.8 cm (22.3in)

The Turbosmooth modifier is assigned to the model in the scene in Render Iterations=2 mode, which is applied only during rendering.
The model is saved in the obj file using Turbosmooth.

All objects have normal names.
All materials have convenient names.
All textures have a unique name with the model of this chair.

Weight of the model without Turbosmooth:
26,176 polygons
26,414 vertexes

The Pivot Point is aligned to the center of the model.

Who works in a V-Ray version lower than 3.1 be careful, in the materials in the BRDF section there is a 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 at least 1.5, since the glossiness of the materials is configured with PBR in mind.