For keyed exterior doors. Both levers lock or unlock by key outside or turnbutton inside. Maximum Security locksets feature 2x strength full 1" throwbolt maximum security strike, and free-spinning guard. DOOR PREP: 2-1/8" Cross Bore, 1" Edge Bore, 1" x 2-1/4" Latch Face. BACKSET: 2-3/8" standard, 2-3/4" optional. DOOR THICKNESS: 1-3/8" to 1-3/4". CYLINDER: 5-pin. FACEPLATE: 1" x 2-1/4" round corner. STRIKES: 2-1/4" full lip round corner. BOLT: 1/2" throw. HANDING: Non-handed. ANSI/BHMA: Grade 3.