Yale - Satin Stainless Steel or Antique Brass - ( Single or Double ) Cylinder Deadbolt WITH 3 KEYS (Single Lock - Twist inside to open/lock) (Double Lock - Use keys to open/lock) ESSENTIAL SERIES Materials : Chassis : Steel Latch or Bolt : Zinc Cylinder Housing : Steel Backset : 60mm or 70mm Door Thickness : 35-50 mm for Essential Function : Residential applications ---------------------------------------------------------------- V81 SERIES • Standard: ANSI / BHMA A156.5.2001 • Testing Cycles: Tested up to 100,000 cycles • Materials: - Chassis: Steel - Latch and Bolt: Zinc - Cylinder Housing: Steel - Round Plate: Brass • Backset: 60mm / 70mm • Door Thickness: 35-45mm for V81 • Function: Residential applications. • Anti-Sawing Insert: Hardened Steel • Cylinder: Solid Brass 5-pin tumbler cylinder • No. of Keys: 3pcs of nickel plated brass key