Features2 in square, two piece connector provides 1-1/2 in surface contact between conductorsAccepts all lightning conductors and rods up to 5/8 in in diameter and grounding conductors ranging from #6 AWG through 4/0 AWGBottom casting is drilled and tapped 1/2-13 UNC coarse threadTop piece is bored out to accept 1/2 in threaded rodRecommended installation tool 1/2 in socket wrench, end wrench or nut driver