Schlage Indicator Deadbolt The Schlage B571 indicator deadbolt is versatile and economical Grade 2 deadbolt for medium duty commercial and heavy duty residential applications. With it"s ADA compliant thumbturn and "VACANT" or "IN USE" indicator on the exterior, it is a perfect deadbolt for a public restroom or other room where privacy is needed. Features: Safety Release Key Included Door Bolt Occupancy Indicator Reads "IN USE" or "VACANT" Deadbolt thrown or retracked by inside turn unit Standard metal dustbox included Additional space inside strike box for true deadlatch Deep drawn, single piece steel housing 10% Larger diameter deadbolt Bolt Contains hardened steel pin inside to prevent attack by sawing Large, easy-to-use, ADA compliant thumbturn Adjustable backset with lock-in-place helix design Specifications: Fits 2-1/8" (55mm) diameter bore hole prep standard Backset: Adjustable 2-3/8" or 2-3/4" Door Thickness: 1-3/8" to 1-3/4" Standard ANSI Grade 2 strength Dead Bolt: 1" throw with saw-resistant hardented steel insert Square Corner Latch Faceplate Warranty: Commercial - Three-year Limited, Residential - Full Lifetime Mechanical