The Kwikset 660 is a traditional-style single cylinder deadbolt for exterior doors where keyed entry and security are needed. It operates by key from the outside and by thumb turn from the inside.

• Function: keyed one side - key outside, thumb turn inside
• Finish: Satin Chrome (26D)
• ANSI/BHMA Grade 3
• 1" deadbolt throw
• Fits doors 1-3/8" to 1-3/4" thick
• 2 keys included
• Installs with a screwdriver