Several options for standard nails and dowels:
- Construction nail (4.0x100)
- Mounting dowel (option 1) (4.5x60)
- Mounting dowel (option 2) (3.7x32)
- Finishing nail (1.4x30) - copper/bronze/steel
- Rough nail (2.5x40)
- Screw nails (3.5x70)

Easily adjusted to the desired size through simple transformations

Geometry:
- under subdiv
- number of polygons from 160 to 973 for one fastening element


Textures:
- UV for all elements
- 8 sets of PBR (Metal/Rough) 2k textures
- for one element - 1 set

Those who work 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. Select Blinn, Phong or Ward - what is preferable for you.

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