Cifial Asbury 571.100 Series Single Cylinder Deadbolt
Cifial has discontinued all their lock hardware, limited to existing inventory

This lock is a good replacement for Old Style Dexter or Master deadbolt lock used on steel Security Doors
Old Style Security Doors had a small deadbolt hole, that was about 1-3/4 to 1-7/8 in Diameter. Most of todays locks require a 2-1/8 inch bore.
The latch bore was normally 7/8 diameter and many of todays current lock hardware  require a 1 inch bore and will not work.

Function: Single Cylinder Deadbolt Lock
Latch Backset: 2-3/8 inch
Minimum Cross Bore Requirement: 1-1/2 inch
Minimum Latch Bore Requirement: 7/8 inch
Cylinder Type: Rim Cylinder, Solid brass housing
Cylinder Screw Holes: 1 inch spacing
Color / Finish: Satin Nickel or Oil Rubbed Bronze ( almost black)

Contents:  See Additional Images