Emtek 8450 Single Cylinder Deadbolt - Flat Black
Single cylinder deadbolt operates with a key on the exterior and a thumbturn on the interior 

Specifications:
Backset: 2 3/8"
Classification: Residential
Color: Bronze
Cross Bore: 2 1/8"
Diameter: 2.38" (60 mm)
Door Thickness: 1 3/8" - 2 1/4"
Specific Finish: Oil Rubbed Bronze
Base Material: Brass
Mount Type: Tubula
Diameter: 2 3/8"
Hardened Steel Bolt