This is a heavy duty auxiliary deadbolt for adding a separate dead locking point to a door. The descriptions call it a Grade 1 deadbolt. It is offered with different latch, strike and cylinder choices, and some versions ship without a cylinder. Part QDB180 625 NOL 478S LC is the Single Cylinder, No Latch ANSI Strike, Less Cylinder version in Bright Chrome.

• Single Cylinder
• No Latch ANSI Strike
• Less Cylinder
• Finish 625 Bright Chrome
• Part number QDB180 625 NOL 478S LC