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Detail this asset from Unity Asset Store: Original Link
This is a paid asset, but we’ll share PBR Keys pack Free for you. Enjoy!!!
PBR Keys pack v2.0
PBR Keys pack
This package contains 9 keys.
Meshes have poly and UV maps optimized to be used in games.
PBR Textures provided are 4096×4096 (you can downgrade quality if you wish)
3 different materials included: Clean, Damaged, Special.
UPDATE 23/02/2016:
-Added new keys.
-Added 2nd style for keys1.
-Fixed scale problems.
-Added 5 locks with animations included.