This is a Grade 2 auxiliary deadbolt from Stanley Security. It is a single cylinder deadbolt built for a small format interchangeable core (SFIC). It adds a separate deadbolting point to a door that already has a primary latching lock. Part QDB281 625 S4 478S LC is the Single Cyl SFIC Less Cylinder, Square 2-3/4, Ansi 4-7/8 X 1-1/4 Strike version in Bright Chrome.

• Single Cyl SFIC Less Cylinder
• Square 2-3/4
• Ansi 4-7/8 X 1-1/4 Strike
• Finish 625 Bright Chrome
• Part number QDB281 625 S4 478S LC