Base Type: Medium Base | Brand Name: Leviton | CSA LIsted: Yes | Casing Color: Black | Light Source: Incandescent | Material: Phenolic | Number in Package: 1 pk | Number of Circuits: 1 | Packaging Type: Carded | UL Listed: Yes | Volts: 250 volt | Watts: 660 watt Medium-medium base, adapters and extensions, incandescent, phenolic lampholder, 1-3/16 inch, to be used in phenolic sockets only, black. | One-piece socket extension | To be used in phenolic sockets only | Compatible only with phenolic sockets