Performance complies with ANSI (American National Standards Institute) A156

5, Series 4000

UL (Underwriters' Laboratories) rated

3 hour fire door

6 pin solid brass cylinder

Adjustable backset

1-1/8" x 2-3/4" Square corner, T-strike

Door frame strike reinforcer with 3" screws

7/8" wrought brass trim ring

Push-button locking

Can be opened from outside with small circular tool

Turning inside knob releases button