Raychem roof clips are used to help secure Gardian roof and gutter de-icing cables to shingle or metal roofs. Secured to roofs using adhesives, nails, or screws. If using adhesive to secure the clips, check with a roofing contractor in your area for the appropriate adhesive / roofing cement for your roof type and climate. Use approx. 1 clip per 2 to 3 feet of cable Model #: H913