Preso Matic Double Combination Lock, models DC9101, DC9102LT, & DC9200, is a keyless door lock designed for use by individuals with fine motor or grasping disabilities. These mechanically operated 4- or 7-digit combination locks are for in-or-out swing doors. Models DC9101 and DC9102LT are manually-locking deadbolt locks with a hardened steel free turning bolt. Model DC9200 is an automatic locking deadlatch lock with a hardened steel throw spring deadlatch bolt. DIMENSIONS: 5/8 inch bolt projection and standard 2-3/8 inch backset (DC9101), 1 inch bolt projection and 3 inch backset (DC9102LT), or 5/8 inch bolt (DC9200). COLORS: Black pebble or satin chrome. WEIGHT: 6 pounds.