Lockable from one side with turnbutton. Constructed of all metal components. Removable KW1 Keyway cylinder for rekeying. Solid brass one-piece cylinder drilled for construction keying. Levers are constructed of finest diecast materials for consistency. Adjustable backset 2-3/8" to 2-3/4". Full lip 1/4" radius round corner strike. Fits doors from 1-3/8" to 1-3/4" thick. Exceeds ANSI Grade 3 standards. For left or right handed doors.