Magnetic wrist band with magnets for holding screws nails etc

Where has this been all of my life?  This summer we put on a new deck for our pool, and had to try and hold extra screws in our hands, or pockets or mouths.  I put this on the other day, and put the extra screws on it, and was about to work almost non-stop.  The screws load onto the strong magnets and come off easily as you need them.  Any porject with nails, screws, bolts etc just got made easier.  Also, when I needed several different bits for my  portable screwdriver, I just put them on this cuff, and I wasn't having to try and keep track everytime I had to change bits.  I'm giving one to my son-in-law so he can help me with my projects.  This is a great invention!!!!