This Baldwin Hardware 8011 double cylinder deadbolt is intended for doors with a 1-5/8" bore hole. This baldwin deadbolt is constructed of solid brass for strength and smooth operation. Baldwin 8011 deadbolts feature a extended hardened steel insert for maximum protection and security. Meets ANSI Grade 1 requirements. Please call (866)259-8901 if you have any question or would prefer to order by phone. We are here to help!