Case formed of heavy gauge steel for strength and assures solid fit in door preparations. Most interior parts are made of solid brass for maximum strength and smooth operation. DOOR PREP: 1-5/8" and 2-1/8" as specified by model number. DOOR THICKNESS: Fits 1-3/4" doors. CYLINDER: Housing protected with free-turning exterior cylinder guard fabricated from solid brass to resist gripping or twisting. Supplied with KW1 keyway and 2 silver nickel keys. 5-pin keying. 1/2" low profile projection. FACEPLATE: 1" x 2-1/4". STRIKES: Specially designed reinforcing, constructed of high grade steel for strength and durability. Installed with 4 security jamb screws (including two 3" screws that resist tampering and guard against theft) and dust box; and is covered with an armored front to conceal fasteners. BOLT: Solid brass 1" throw, when extended, with hardened steel insert for maximum protection and security. HANDING: Non-handed. ANSI/BHMA: A 156.5 Grade 3.