The Nsi G-4 Heavy Bronze Ground Clamp With Wire Adapter Grips On Pipes Between 1-1/4" to 2" In Diameter and Features A Wire Adapter That Swings 360 Degrees to Make Alignment Simple. Heavy Duty Bronze Adapters Have Serrations That Match The Serrations On The Ground Clamp, Assuring A Positive Lock. The Zinc-Plated Steel Screws and Bronze Clamp Body Are Made Of Tough, High-Quality Metals That Provide Durable Performance In A Range Of Applications. Use This Clamp to Connect Grounding Conductor to Rigid Conduit