Morris Products 91670 Ground Clamp, For Armored and Unarmored Wire, 1/2 -1" Water Pipe Range, 8 - 4 Wire Range Ground Clamp for Armored or Unarmored Wire - Our Armored Wire Ground Clamp is Excellent for Grounding Applications Used to ground armored or unarmored wire to water pipe, Copper tubing and ground rod Armored Cable Adaptor Pre-Installed on Clamp Cast of High Strength High Conductivity Copper alloy Supplied with Steel Screws, Zinc Plated for corrosion resistance