The NSI G-16 Heavy Bronze Ground Clamp with Wire Adapter grips on pipes between 4-1/2" to 6" 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 on water pipe. cULus Listed 467 for Grounding and Bonding. Stock products you can rely on—stock NSI.