For residential single and multi-family entrance doors. Deadbolt thrown or retracted by key from either side, bolt automatically deadlocks when fully thrown. 7/8 in wrought brass trim ring reinforced with security inserts. Concealed spin ring rotates to protect against wrenching the cylinder. Solid steel door frame reinforcer with 3 in screws protects against kick in attacks. Solid, 1-Piece design to protect against hammer and crowbar prying attacks. 2-1/2 in steel adapter ring, plated to match, provided for accommodating 2-1/8 in crossbore. Door prep 1-1/2 in or 2-1/8 in Crossbore, 7/8 in Edge Bore, 1 in x 2-1/4 in Latch Face. Door thickness 1-3/8 in to 1-3/4 in. Cylinder Solid brass, 5-pin, tumbler C keyway with nickel silver, pick-resistant, spool pins and 2 nickel silver, 5-pin, C section keys. Faceplate 1 in x 2-1/4 in. Strikes of 1-1/8 in x 2-3/4 in, no lip, with dust box and door frame reinforcer. Bolt 7/8 in housing and 1 in throw with concealed hardened steel roller to prevent cutting or sawing. ANSI/BHMA exceeds A 156.5, 1992 Grade 2 with Grade 1 security features. Fits all doors, 2-3/4 in or 2-3/8 in backset, square corner, round corner or drive in preps. Secure Key feature allows you to re-key the lock without ever removing it from the door.