This is a paid asset, but now you can download Gear + Saw Pack Free.
Detail this asset from Unity Store: Original Link
Gear Saw Pack v1.1 (Latest version)
“If possible, please buy the package to support the developer”
Asset includes 6 High Quality industrial gears and saws.
– 1024 & 512 maps (diffsue , normal , specular)
– 100 ~ 2000 tris
– Optimized mesh colliders
– Low Poly
– PBR Materials
– Real world size
– PC / AR / VR / Mobile ready