Usage Tips:Features: Make of ABS 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 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: ABS Height option: 1cm(0.39inch)/2cm(0.79inch)/3cm(1.18inch)/4cm(1.57inch) Package Includes: 1Pc Electrical Outlet Box Extender note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.