The Tell CL100056 Double Cylinder Deadbolt is a standard duty commercial double cylinder deadbolt. It is made of satin stainless steel (US32D) and complies with ANSI A156. 5, grade 2 (150,000 cycles). It has a 6 pin SCC keyway with 2 nickel keys per lock. The door range is 1-3/8 inch size to 1-3/4 inch size. The backset is adjustable. It also features a tubular construction.