The Tell CL100011 Brushed Chrome Entry Lever Lock is a heavy duty commercial entry lever. It is a satin chrome (US26D) finish. It complies with ANSI A156.2. It is a series 4000, grade 2 (400,000 cycles) knob. It is UL listed for a 3 hour fire door ANSI A117.1. There is a 6 pin SCC keyway with 2 nickel keys per lock. It has a door thickness range of 1 3/8-inch to 2-inch. It has a backset of 2 3/4-inch standard and is a standard T strike (1 1/8-inch x 2 3/4-inch). It is cylindrical, steel coated with zinc dichromate (corrosion resistance). Latch bolt is operated by a lever from either side. Outside lever is locked by turn button from inside. It is unlocked by a key from outside or rotating inside lever.