a standard door preparation which consists of a 2-1/8' cross-bore with a 2-3/4' backset, and a 1' edge-bore with a mortise 1-1/8' wide and 2-1/4' highĪ2 n. a standard door preparation which consists of a 2-1/8' cross-bore with a 2-3/8' backset, and a 1' edge-bore with a mortise 1' wide and 2-1/4' highġ61 prep n. A B C D E F G H I J K L M N O P Q R S T U V W X Y Zġ60 prep - n.
