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 619 R8 478S LC is the Single Cylinder, Rad 2-3/8 Latch ANSI Strike, Less Cylinder version in Satin Nickel.

• Single Cylinder
• Rad 2-3/8 Latch ANSI Strike
• Less Cylinder
• Finish 619 Satin Nickel
• Part number QDB180 619 R8 478S LC