Will these work on a metal roof?

Hello Harley. Thank you for your question. The clips in question can be utilized on metal roofing. However there are factors to consider to ensure these clips function as desired to include, the gauge of the metal roof, desired application and proper installation. These clips, nor any clip, should be forced into a position that causes roof damage, during installation or removal. I hope this helps answer your question. If you have additional questions or concerns, please do not hesitate to inquire. Happy Holidays. The Dyno Team.