The Linear H-318 18" Structure Wire Enclosure is ideal for applications in commercial and residential projects. It has a patented grid system that allows for slot or tab mounting into the stud bay. This enclosure has a single-gang electrical box knockout and two additional 2" conduit knockouts on the side rails. Made from 16 gauge metal and UL listed, it is a durable choice for linear structured wiring components. The electrical wire enclosure accepts an H290 or H291 power accessory. It comes with an instruction manual and an optional H208 lock is available.