Sometimes, it's the little things that are the most irritating.  Adding keys to a key ring is one of those things.  My wife always has me do it for both of us, so I'm all too familiar with the havoc key rings can wreak on fingers and fingernails.

The scratching, the poking...just thinking about it feels like nails on a calk board in my head!  But no more!  You can use a common tool to save your fingers from any future key ring torture!  Check it out: