FeaturesInnovative pressed bolt design ensures a smooth flat surface, no damage when used on membrane roofs and provides greater ease of installationAccepts all lightning conductors and rods up to 5/8 in diameter and grounding conductors ranging from 6 AWG up to 250 MCM5/16 in x 1-1/4 in stainless steel cap screw with flat washer includedRecommended installation tool 1/2 in socket wrench, end wrench or nut driver