This is a Grade 1 heavy duty auxiliary deadbolt from Stanley Security. It takes a small format interchangeable core (SFIC) and mounts on a door as a second locking point alongside the primary lock. Strike style, backset and core options vary by part number. Part QDB181 619 R4 FLR LC is the Single Cylinder SFIC, Rad 2-3/4 Latch Fl Lp Rd Stk, Less Cylinder version in Satin Nickel.

• Single Cylinder SFIC
• Rad 2-3/4 Latch Fl Lp Rd Stk
• Less Cylinder
• Finish 619 Satin Nickel
• Part number QDB181 619 R4 FLR LC