Though these Gutter and Shingle Clips are especially ideal when hanging icicle lights and mini lights from gutters and shingles, they can still be used for C7 or C9 lighting installations. These clips are specifically designed so that the front side fits onto a gutter or shingle while the other side has a unique hook that holds the wire in place for professionally straight installations. Please call us with your application questions and we can help you decide what clip works best for you. Sold in packs with 100 clips Christmas light clips Your satisfaction is our #1 priority and if you have any issues, please us know and we will gladly help.