Permaground U-Bolt Ground Clamp, Mechanical connection, Copper material, UL 467 Listed, C22.2 No. 65-03, Copper Primary Conductor 500 kcmil - 300 kcmil, 1 conductors, 1 ports/wireways, pipe size 6, Drive Type Main 3/8 External Hex, 6, 6-1/8, 6-1/4, 6-3/8, 6-1/2 nominal ground rod,