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 in and 2-1/8 in as specified by model number. Door thickness Fits 1-3/4 in 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 in low-profile projection. Faceplate 1 in x 2-1/4 in. Strikes of Specially designed reinforcing, constructed of high-grade steel for strength and durability. Installed with 4 security jamb screws (including two 3 in 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 in throw, when extended, with hardened steel insert for maximum protection and security. Non-handed. ANSI/BHMA A 156.5 Grade 3.