This Yale door knob series provides maximum security with ANSI grade 2 standard and tested at 400,000 lifecycles, and are ideal for heavy duty residential projects. The modern design of these door knobs with a choice of 8 different finishes suits most décor needs.FunctionFunction EntranceTechnical DataBackset 60mm. / 70mm.Bolt ZincCylinder Solid Brass 5-pin tumbler cylinderDoor Thickness 35-50mmFinishing Antique BrassNo of Key 3 nickle plated brass keysStandard ANSI/BHMA A156.2 2003