These are great. I had plastic clips that I used for my outdoor solar led string lights and after two years in our Wisconsin climate they started cracking. These metal clips fit nicely on the lip of my gutters. The clip that you attach the string to is designed for narrow string or wire or Christmas lights. I have thicker cords on my LED string lights (thick like an outdoor extension cord), and I had to force the wires in, but with that said, they're holding up nicely and I'm sure they'll last a long time.