I have used these fasteners a number of times to hold sheet metal in place while drilling and installing solid fasteners and they have worked great. I can't believe I waited so long to get them. I've been able to complete my projects much faster because it's like having two other hands. They apply quickly and are very strong. I highly recommend buying these if you work on sheet metal yourself. I also have a plastic storage box with dividers to sort and keep all the different parts in place. This makes it very easy to choose the right size you need for your job. The set contains many individual parts.