Set-Screw Connector, Size: 2-1/2 IN, Connection: Male Threaded X Set-Screw, Material: Malleable Iron And Steel, Length: 3.19 IN, Thread Length: 1 IN, Diameter: 3.38 IN, Standard: UL 514B, NEMA FB-1, used to secure and terminate rigid metal conduit and IMC to enclosures