This is Itsme64's Better Clean Glass Texture.

What this texture does, is it creates the generic clean glass texture, however it makes the edges twice as thin making them 1/32 of the block instead of 1/16 of the block.

Consider subscribing to my YouTube as I am putting a lot of effort into this pack: https://www.youtube.com/c/Itsme64
Video explaining the texture: 

If you have any questions/comments/concerns/suggestions for future packs please feel free to leave those in the comments section below or contact me via discord: https://discord.gg/f2TH4TQ3J5