PERFECT SOLUTION: Attach ice dam heating cable to your roof without using penetrating fasteners (nails, screws, etc.), which WILL cause roof damage. EASY INSTALLATION: Once you install heat cable with Grip Clips you will never go back to nail-on clips! Simply push the clip onto roofing, hook your heating cable onto the clip, and pinch to secure. Nail holes avoided! NO TOOLS REQUIRED: No tools needed and can be installed in cold weather. UNIVERSAL: Compatible with all manufacturers of ice dam prevention heat cables and most asphalt shingle roofing systems. Select the correct Grip Clip size for your roof material. Model 325 for 1/8" to 3/8", Model 625 for 3/8” to 5/8”, Model 875 for 5/8” to 7/8”. MADE TO LAST: Grip Clips will not loosen and can hold over 40 pounds per clip for a secure long lasting solution. › See more product details