The NSI G-24 Heavy Duty Bronze Ground Clamp for Rigid Conduit grips on pipes between 2-1/2" to 4" in diameter and features a 1" adapter hub that swings 360 degrees to make alignment simple. Heavy duty bronze adapters have serrations that match the serrations of the ground clamp, assuring a positive lock. The zinc-plated steel screws and bronze clamp body are made of economical, high-quality metals that provide durable performance in a range of applications. Use this interchangeable clamp to attach rigid conduit and ground conductors to water pipes in indoor environments. cULus Listed 467 for Grounding and Bonding. Stock products you can rely on—stock NSI.