Copper Ground Pipe Clamps with Adaptor Serrations and Conduit Hub Adaptor 1-1/4" - 2" Pipe - 3/4" Hub - These Copper Ground Pipe Clamps have a Serrated Collar and Conduit Hub Adaptor to Ground Conduit to Water Pipes.Copper Ground Pipe Clamps with Adaptor Serrations and Conduit Hub Adaptors 1-1/4" - 2" Pipe - 3/4" Hub features include: li>Cast Copper Ground Pipe Clamps have Serrations that match the Serrations of the Attached Conduit Hub Adapters Used to Connect Electrical Conduit to Water Pipe, Ground Rods amp; Copper Heater Tubing etc. Serrated Conduit Adaptor Swings 360deg; for Ease of Alignment Cast of High Strength High Conductivity Copper alloy Supplied with Steel Screws, Zinc Plated for corrosion resistance UL Listed Dimension Measurements = Inches Order Qty of 1 = 1 Piece Below is more info on our Ground Pipe Clamps with Adaptor Serrations and Conduit Adaptor 1-1/4" - 2" Pipe - 3/4" Hub