This is a paid asset, but now you can download UKit Katana 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
UKit Katana v2.4
“If possible, please buy the package to support the developer”
This package contains customizable katanas and saya, includes 7 skin.
150 to 1100Tris. per props.
PBR 4k Texture.
*Albedo PSD(Skin1 to 4).
**to get the same results as the screenshot you need to use Post Processing Stack, you can download it for free from PostProcessing.