Leviton 3099F-2E Portable Outlet Box, Single-Gang, Extra Deep, Feed-Through Style, Cable Diameter 0.59-Inch, 1.000-Inch, Black Molded Santoprene TPV Housing is Extremely Durable, Even in Harsh Conditions Non-Metallic Construction Provides Protection Against Electrical Shock Available in Pendant and Feed-Thru Styles Variable Adjust Strain Relief Provides Superior Protection Throughout Entire Range of Cable Diameters Strain Relief Accepts Cable Diameters from 0.230- inch - 1.000-Inch