Operated by thumb turn inside, key outside. Security deadbolts feature full 1 in solid core throw bolt, all metal mechanisms, anti-pry shield. Door Prep: 2-1/8 in crossbore; 1 in edge bore; 1 x 2-1/4 in latch face. Backset: adjustable 2-3/8 to 2-3/4 in. Door Thickness: Fits 1-3/8 to 1-3/4 in doors. Cylinder: 5-pin. Faceplates: 1 x 2-1/4 in round corner. Strikes: 1 x 2-1/4 in round corner. Bolt: 1 in throw. Handing: Reversible for right or left handed doors. ANSI/BHMA: Grade 3.