Original shingle tab injected with TuffClips’ break-resistant plastic. Two-hole design allows for use with both c9 and c7 size bulbs. For use on asphalt, tile or cedar shake roofs. Can be used in conjunction with parapet clips. Dual folding leg tabs allow for a tighter grip. Clips can easily slide over bulbs and secure between the bulb and socket – Allowing installers to prebulb their strands.