The Tell CL100201 Light-Duty Commercial Satin-Finish Entry Lever performance complies with ANSI A156.2. series 4000, grade 2, (400,000 cycles). It is UL listed for a 3 hour fire door. It has a 6 pin SCC keyway with 2 nickel keys per lock. The door thickness range is 1 3/8-inch to 2-inch and is has 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). It has tubular construction. Latch bolt operated by lever from either side. Outside lever locked by push button from inside. Unlocked by key from exterior or rotating inside lever.