Asset Overview
Freebie - Game Art: Graters, Low Poly, PBR Maps
3DS Max, Xnormal, Substance Painter, Photoshop
The 3D Model has the shading build at vertex level. For this matter it should be imported in your 3D Software, Game Engine without smoothing groups.
For example in UE4 - Import Normals and Tangents
Enjoy!
Cheers!