One-Sided Function: One-sided deadbolts work via thumb turn on the interior side of the door without any keying or unlatching function on the exterior. Often times they are used on panic rooms dark rooms or back doors where exterior/keyed entry is not required when occupied but can be installed anywhere that additional secured privacy is needed. Features: Deadbolt casing is constructed from heavy gauge steel Solid brass construction for increased durability Meets standards for BHMA Grade 1 certification Covered under limited lifetime mechanical and 5 year finish (living finishes excluded) warranties Specifications: Backset: Adjustable 2-3/8 or 2-3/4 Face Bore: 1-5/8 Edge Bore: 1 Door Thickness: 1-3/4 Rose Diameter: 2-1/2 Material: Solid Brass