Downtown, a square slim deadbolt is the latest in contemporary design and a perfect accent for the style-conscious consumer. 50% less protrusion than standard deadbolts; interior turn piece meets 4.13.9 ADA requirements, ensuring accessibility to all disabled persons; exposed screws on interior thumb piece; ANSI/BHMA Grade 1 certified; "SmartKey" re-key technology is compatible with Kwikset (KW1) keyway; solid zinc construction; detent spring to align turn piece; tapered bolt to protect against warped doors; optional UL 1/3 hour fire rating.