The Tell CL100199 Light Duty Commercial Privacy Lever Lock has a satin chrome (US26D) finish with a tubular construction. Its performance complies with ANSI A 156.2. series 4000, grade 2 (400,000 cycles). It is UL listed for a 3 hour fire door. It has a door thickness range of 1 3/8-inch to 2-inch and an adjustable backset of 2 3/8-inch to 2 3/4-inch, with a standard T strike (1 1/8-inch x 2 3/4-inch). Latch bolt is operated by a lever from either side. Outside lever is locked by a push button on interior. Unlocked by an emergency release on exterior or by rotating interior lever.