Skeleton Entry Set: A skeleton entry set has a locking device operated by a large toothed skeleton key. They are traditionally used where additional security is needed but are primarily aesthetic, providing a rustic appearance. They are not recommended for use with a front entrance. Features: Durable, high quality solid brass rosette with crystal knob Works with many original (pre-1950s) locks Reversible handing for left or right hand doors Designed for doors between 1-3/8" and 1-3/4" thickness Mortise hardware requires special door preparation Includes square corner latch plate Covered under a 5 year limited warranty Does not meet criteria for ADA (Americans with Disabilities Act) certification Hand assembled in the United States Two skeleton keys are included with purchase Product Technologies: Solid Brass Construction: Nostalgic Warehouse backsets and rosettes are forged from a solid piece of brass. This process yields a denser, stronger and higher quality product that can better display intricate designs than casted door hardware. Genuine Crystal Knob: Crystal knobs are constructed of at least 24% lead crystal. Crystal is both stronger and more reflective than glass; displaying a bright sparkle and rainbow prism effect. Specifications: Backset: 2-1/4" Cross Bore: 2-1/8" Edge Bore: 1" Door Thickness: 1-3/8" to 1-3/4" Handing: Reversible Left or Right Handle Height: 2-1/8" Handle Width: 2-1/8" Handle Projection: 2-1/4" Trim Height: 2-1/2" Trim Width: 2-1/2" Latch Faceplate: Square Corner Material: Brass, Crystal