Features: Installation Box 86 Type 2 Gang 3 Gang 4 Gang Switch Socket Base Outfit Junction Box Surface Mount Bottom Box Wall Switch Socket Dark Box White Specifications: Box Size (L * W ): Singel: 86mm * 86mm * 35mm Double: 172mm * 86mm *35mm Trible: 258mm * 86mm * 35mm Quadruple: 345mm * 86mm * 34mm