Steel project box, 18 ga. chassis and a 16 ga. cover. Overall dimensions are 12-7/8" x 11-3/8" x 3", inside dimensions are 12-1/8 x 11" x 2-5/16". Supplied with a durable black powder coat finish, rubber screw-on feet and the screws to assemble the enclosure. There is no cable exit hole, there is no standard size and it is sometimes not needed so we don't punch it for one. Any additional holes must be done by the end user. If the unit is ordered in quantity, we can pre-punch that hole as well.