The NSI G-25 Heavy Duty Bronze Ground Clamp for Rigid Conduit grips on pipes between 4-1/2? to 6? 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. UL Listed 467 for Grounding and Bonding. Stock products you can rely on.stock NSI. Features: Rotating Hub - Bronze hub rotates 360 degrees around the clamp to make alignment simple, no matter the direction of your install; Range of Sizes - The G-25 Heavy Duty Bronze Ground Clamp fits pipes between 4-1/2? to 6? in diameter and rotating bronze hub fits 1? rigid conduit or ground conductors; Bronze and Steel - The clamp and hub are made from bronze, while the tightening screws are made from reliable zinc-plated steel, both of which provide durable long-term use; Interchangeable Design - The adapters and hubs of NSI grounding clamps are interchangeable, allowing for adjustment on the fly and greater installation flexibility; UL Listed - The reliable NSI grounding and bonding products meet UL 467 performance standards for grounding and bonding