Wiremold WM 2337A-WH: Round Box Extension- For hanging fixtures, smoke/fire alarms and other security devices with 3.5" [89mm] or 4-1/16" [103mm] mounting centers. 5.5" [140mm] diameter with open base. Not for use with fans.
Round Extension Box Type; Non-Metallic Material; White Finish; 1 Inch; 400/800/2300/2300D Series Raceway Used on; UL (Canada and Us) Approval; 5-1/2 Inch Diameter; 600 V Outlet Rating; 2300 Model
Part Number: 2337A-WH