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 2, Drive Type Main 3/8 External Hex, 2, 2-1/8, 2-1/4, 2-3/8 nominal ground rod,