Gainsborough Double Cyclinder Smooth Round Dead Bolt Satin Graphite 1951SMSGV Model: 1951SMSGV Finish: Satin Graphite The Gainsborough Smooth Round Double Cylinder Deadbolt features a slight taper on the cap and is well suited to a variety of entrance styles. Through a cleverly designed and patented snap on the fixing system, the fixing is concealed for a cleaner look. To lock or unlock, use the key on either side. Single Cylinder Deadbolt and square variants are also available. Features: Highly secure double cylinder deadbolt with a round profile Featuring clean lines and minimalist look designed to work seamlessly with other fixtures Patented snap on fixing system for concealed fixing Lock or unlock the deadbolt, use a key from the outside and inside Application: External Backset (mm): 60 Bore Hole (mm): 54 Edge Bore (mm): 22 Locking: Locking Latch included: false Manufacturer's Warranty (conditions apply): 5 Year Tarnish Warranty - 10 Year Mechanical Warranty