Doorking 1814-155 Flush Rough In Box ONLY, provides secure housing for DKS access control devices during a flush mount installation. The rough-in box is installed in the wall first, and the trim ring (SOLD SEPARATELY) is then slid into the box. The kit is used with Flush Mount 1803, 1810, 1833, 1834, 1835, and 1837 Telephone Entry