Anyway, I've got a real soft spot for larger folders too, which aren't always appropriate carries, but are knives I like a lot. I'm thinking that 4" is where the really big folder category begins, but there are quite a few just a taste under that, so let's start at 100 mm or 3 7/8" and you can show us what you have for large folders. I certainly wouldn't quibble over a mm or two....