ANSI Grade 2; UL 3 Hour Fire Rated; Schlage SC4, 6-Pin Keyway; Meets ADA Requirements; Thumb Turn And Escutcheon Are Fabricated From Forged Brass; Locked Or Unlocked By Key Outside Or Thumb Turn Inside; Ships With A Fire Rated 2 3/4 Inch Backset Latch; 2 3/8 Inch Backset Latch (Product # CDL60MM) Sold Separately; Fabricated With Stainless Steel Covers, Steel Internal Mechanism; Satin Chrome Finish.