DELIGO ER20 Metal Galvanized Steel Circular Extension Ring Twenty Millimeter\r\n- Extension rings Extend the depth of malleable conduit box.- Pre-Galvanized Steel Construction.- For use with 20mm Conduit Boxes.- Circular extension rings have two lugs fitted with M4 brass inserts.- Two plain bored lugs.\r\nDELIGO ER20 Metal Galvanized Steel Circular Extension Ring Twenty Millimeter have two lugs fitted with M4 brass inserts and two plain bored lugs. The 20 mm extension ring in black anodized aluminum is one of various sizes of extension rings. Extension rings are used to create the correct distance between the port and the housing. Extension rings extend the depth of malleable conduit box.\r\nFeatures:\r\n- Finish: Galvanized.- Size: 20mm.- Accessory Type: Extension.- Construction Material (Electrical): Pre-Galvanized Steel.- Parent Material (Electrical): Metal.- Product Type: Extension Ring.- Manufacturer: Deligo Ltd.- Condition: New.- Brand: DELIGO.- Screw Fitting places: 4.