Once you install heat cable with Grip Clips you will NEVER return to nail-on clips. Grip Clips WILL NOT void your roofing warranty (unlike traditional nail-on clips). NO TOOLS are needed and Grip Clips install 10x faster than nail-on clips. Because only ONE clip is use on the bottom of each serpentine heat cable pattern, Grip Clip installations require 30% less clips that traditional nail-on roof clips. Grip Clips can be used on a wide variety of roofing materials which range in thickness from 1/8” (Model 325) to 3/4” (Model 875), including cedar shakes, Davinci shakes/slate and all other types of synthetic roofing. Grip Clips are the ONLY heat cable clip that allows for a building-code-compliant application of heat cables near the center of the roof valley, where you want them.