Permaground U-Bolt Ground Clamp, Mechanical connection, Copper material, UL 467 Listed, C22.2 No. 65-03, Copper Primary Conductor 250 kcmil - 2/0 Str and 4/0 Sol - 2/0 Sol, 1 conductors, 1 ports/wireways, pipe size 3/8, Drive Type Main 3/8 External Hex, 5/8, 3/4 nominal ground rod,