The NSI G-4-S Bronze Ground Clamp for Water Pipe grips on water pipes between 2-1/2" to 4" in diameter for quick and easy assembly. The zinc-plated steel screws and cast bronze clamp body are made of economical, high-quality metals that provide durable performance in a range of applications. Use this clamp to easily bond bare copper wire to a water pipe or for use as a water meter shunt. UL Listed 467 for Grounding and Bonding. Stock products you can rely on—stock NSI.