Latch by lever inside, key outside. Outside lever always locked Exclusive clutch feature allows outside lever to turn when locked without retracting latch. Recommended for all commercial applications ; Features: Clutch lever reduces stress and wear ; ADA recommended ; Made in U.S.A. ; Lifetime warranty ; Packed 12 per case ; Finish: 26D Dull Chrome ; Specifications: Grade 1: U.L. Listed, 3 Hour fire rated, ANSI A156.2, 1996 Series 4000 ; Door Thickness: 1-5/8'' to 1-7/8'' standard ; Backset: 2-3/4'' standard ; IC Cylinder: Less core. Will accept 6 or 7 pin Best/Falcon core ; Latch: (#1834) Backset: 2-3/4'', Front: 1-1/8'' x 2-1/4'', 9/16'' throw ; Strikes: 4-7/8'' x 1-1/4'' ASA strike with curved lip ; Levers: Solid cast Zamac with 1/2'' return of door ; Roses: Thru-bolted, 3-1/2'' diameter, spring loaded, automatically adjusts for door thickness