I carried aboard a thick "briefing book" held together with a metal fastener - two vertical spindles that slide through the punched holes of each piece of paper, are topped with a piece of metal, and then fold flat to make a compact package. (I'm sure these have a name but I don't know what it is). I disassembled the materials to remove some and realized that those spindle points were as sharp as any nail file and could even be made needle point sharp, though they aren't very strong. Apparently it didn't bother the Xray inspectors.

Sylvia