Operated by key outside and thumb turn inside. Door Prep: 2-1/8 in or 1-1/2 in crossbore; 1 in edge bore; 1 x 2-1/4 in latch face. Door Thickness: 1-3/8 in to 1-3/4 in standard. 1-7/8 in to 2-1/4 in optional. Cylinder: 5-pin SmartKey cylinder. Faceplate: 1 x 2-1/4 in. Strike: 1-1/4 x 3-5/8 in. Bolt: 1 in throw, stainless steel. Handing: Reversible for right or left hand doors. ANSI/BHMA: Grade 2. ADA: Interior turn piece meets 4.13.9 ADA requirements. Deadbolts with SmartKey in (denoted SMT) feature allow, in 3 steps, locks to be re-keyed to a spare set of keys. When the spare keys are done being used, the lock can be re-keyed back to the original set of keys; can continually be re-keyed.Add to a keyed knob or lever for additional securityFeatures adjustable latch and deadbolt to fit all standard door preparationsFeaturing SmartKey Security, which protects against advanced break-in techniques and allows you to re-key your lock yourself in secondsSmartKey cylinders feature a stainless steel side locking bar, racks and pins for increased strength and securityPatented side locking bar technology offers improved security by protecting against lock bumping, an attack technique used to defeat conventional pin and tumbler locks