For over 40 years Omnia Industries has supplied the architectural hardware industry with hardware that is stylishly designed yet exceptionally functional. This Omnia hardware D11752AC double cylinder entry set is manufactured of solid forged brass for maximum strength and durability. Omnia entry sets require 5-1/2" CTC (Center to Center) bore holes. This set includes both inside and outside trim plates, 2 levers, all locking and mounting hardware needed for a complete double cylinder entrance set. If you have any questions at all or would prefer to order by phone please call (866)259-8901. We are here to Help!