Yale 700RB-C3-4 Security Barricade Ball Entry Knob, Polished Brass Keyed entry ball knob for residential entry doors All-metal, adjustable latch for durability and easy installation Backset adjusts from 2-3/8 to 2-3/4 inches for a wide variety of door styles Spindle length accommodates 1-3/8- to 2-inch door thicknesses Simple installation with screwdriver only