Brand Name: Sigma Electric | Bushing Inside Diameter: 1 in. | Bushing Outside Diameter: 1.52 in. | Bushing Thickness: .07 in. | CSA LIsted: Yes | Conduit Size: 1 in. | Insulating: Yes | Material: Zinc | Number in Package: 1 pk | Packaging Type: Bagged | Sub Brand: ProConnex | Trade Size: 1 in. Sigma's Insulated Metallic Grounding Bushings are used on the end of Rigid conduits, IMC and other threaded connectors to provide a smooth, well rounded bearing surface to protect wires or cables as well as providing a means to connect a grounding conductor with a feed-through lug. | Provides smooth surface to prevent damage to the wire when pulling | Provideds a means of grounding with feed-through lug for easy attachment of grounding wire | For use with 1-in Rigid conduit or IMC and wire range #14 - #4 | Zinc die-cast construction with aluminum lug | Product is cULus listed