This is a paid asset, but now you can download Reality Level Gears for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Reality Level Gears v1.0
Looking for cool gears as machinery parts or decorations?
This asset provides you with 66 HQ gears (22 pictures * 3 cog types) – each with 4 PBR materials to choose from.
Materials consist of Albedo, Metallic and Normal maps of 2048*2048 resolution.
Models’ poly-count is mostly between 500 and 1500.
Low-poly colliders are provided.
Looks great on machinery if rotated at RPM less than 100 😉