The 350A is a large, Grade A, attack-resistant enclosure that has a heavy 16-gauge rolled steel door, tamper switches, and an inside mounting bracket for a wire-in transformer. Models 350B, 350C, and 350D can be added to provide for accessory module installations and additional conduit positions. UL listed. Dimensions: 17.5" W x 13.5" H x 3.75" D