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!!!!