Features: Make of plastic materials, with good heat resistance, which can be installed in commercial, industrial or residential environment. Rounded corners, safe and anticollision without hurting hands, and the edges is smooth and delicate without burrs. Our electrical box extenders is designs to provide solution for extending electrical box plastics to accommodate new or existing wiring. Designs to install easily and firmly in single electrical box. No need to dismantle the existing box or reposition wiring. Simply attach our extenders to your current outlets, you ready to expand your electrical option. Specifications: Materials: Plastic Style: 10mm wire box height pad/20mm wire box height pad/30mm wire box height pad/40mm wire box height pad/10mm spacers with aid inner wall/20mm spacers with aid inner wall/30mm spacers with aid inner wall/40mm spacers with aid inner wall Side length: 86mm/3.39inch Hole spacing: 60mm/2.36 inches Height option: 10mm (0.39inch)/20mm (0.79inch)/30mm (1.18inch)/40mm (1.57inch) Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color. Package includes: 1set Electrical Outlet Box Extender