The ES Series Enclosures are IP65 and NEMA 4X boxes which protect agains harsh environments. The -MB Series has external mounting patterns so mounting holes are not required in the bottom box. They meet NEMA 1, 2, 4, 4x, 12 and 13 specifications. The boxes are made of high-impact ABS plastic, providing corrosion resistance. They are non-UV stabilized. Dimensions: 6.73"L x 4.76"W x 2.1"D.