With a variety of styles, functions and finishes, Kwikset's knobs are sure to define your decor from the moment someone walks into your home.Specifications: Door Prep:Cross Bore 2-1/8Edge Bore 1 Backset:Adjustable to 2-3/8 or 2-3/45 available as service part Door Thickness:1-3/8 1-3/4 doors standard2-1/4 doors optional on 200 and 400 models only Cylinder:SmartKey Security or Pin & Tumbler Faceplate:1 x 2-1/4Specify round corner, square corner or drive-inAlso available as drive-in latch Strikes:2-1/4 full lipSpecify round corner or square corner. Keyed Entry:Both sides locked or unlocked by key outside or turnbutton inside.