These really are exceptional. "Normal" cutters WILL be damaged the very first time you try to cut steel, these are DESIGNED to cut steel (up to 1.75mm thick).
WHAT I DON'T LIKE ABOUT THIS ITEM
Very expensive. In fact, I got them especially for a customer a few years ago, and then they changed their mind about buying, and I'm fairly certain they cost me over £20.00. Since this is not something I would normally sell - reduced to clear.