Suitable for copper wires ONLY 4 pre-drilled holes to suit installation in any direction Metal spring lock button to secure the outlet box cover in place Anti-Theft - blank holes allow installation of pad lock for enhanced security Packaging includes 3 covers with different sized holes (1/2", 3/4" and 1"), allowing you to choose from various thread sizes Specifications Product Size 17.5 x 13.5 x 15.5 cm Operating Ambient -20°C ~ +85°C Storage Environment -20°C ~ +60°C Case Quantities 6