Arlington Siding Mounting Kits with Built-in Box For smooth vertical mounting of light duress on all siding types. Kit includes mounting block with build-in electrical box, NM blossom connector, and 4 screws. Printable, UV rated plastic for long outdoor fife. Features and Benefits = Mounds light fixtures on all siding types, including T-111, HardiePlank® Lap Siding, and fiat surfaces « Fast and easy to install... .