Features and Specifications:
For Doors: 1-3/4" (44mm) to 2-3/8" (61mm) door thickness [except 475 with 2-1/16" (53mm) maximum thickness.] (1 3/8" door optional as 1-Option)
Door Prep: 1-1/2" dia. (38mm) hole standard for all functions 2-1/8" dia. (54mm) hole (161 door prep) for 474 and 475 only with adapter ring provided
Backsets: 2-3/4" (70mm) standard. 2-3/8" (60mm) optional (20- option)
Strike: Wrought brass, bronze or stainless steel
Bolt: Solid steel with hardened steel pin insert and nickel silver plating 7/8" (22mm) x 5/8" (16mm) x 1" (25mm) throw
Cylinder: Brass, 6-pin. 2 nickel silver keys
Front: Wrought brass, bronze or stainless steel 2-1/4" (57mm) x 1-1/8" (29mm) with fixed bevel 1/8" (3mm) in 2" (51mm) furnished standard
Handing: Non handed, field reversible
Turn Lever: Non-ferrous
Housing: Non-ferrous, reinforced, one piece 2-1/2" (64mm) diameter.  LFIC options: housing brass & zinc, two piece. Concealed screws on double cylinder function.

Meets ANSI A156.5 Grade 1 requirements with 408 or 488 strike
UL/cUL Listed UL listed to U.S. and Canadian safety standards
Positive Pressure Conforms to standards UL 10C and UBC 7-2 (1997)

Mechanical Options
16- 400 “T’’ shaped strike with strike box
20- 2-3/8" (60mm) backset. 2-3/4" (70mm) x 1" (25mm) wide front
28- 408 Flat lip strike ANSI A115.2
36- 6-Lobe security Head Screw
37- Spanner Head Screw
48- 488 Reinforced strike with 4 mounting screws and strike box