Thomas & Betts Carlon Model B121ADJ, ADJUST-A BOX, 1 Gang Switch Box PVC Adjustable
Provides simple installation and allows adjustment from 0 to 1-3/4" with the turn of a screw. Clip the included bracket onto any stud, mounts square and secure every time. Securing the bracket to the stud ensures that the box will not move. Comes preset at 1/2". 3-3/8" depth x 3-7/8" x 3-3/4". Permissible for use with 90 degree C connectors. Satisfies NEC 370-20. UL Listed 5Z74 and classified 2 Hr W/C.