Hi m8

I have no idea the grade, its 4mm thick from where my dad used to work and when they shut down it was being chucked out, so I grabbed it all, (like you do when no one is looking lol). Its quite hard to drill, but they used to make displays cabinates, so guessing its not going to be high grade stuff seeing as it was only for shelves signs and odd stuff like that.

:) Don