Yale 827RT-C7-4 Security Barricade Tulip Knob Combo Kit, Satin Chrome Keyed entry tulip knob for with single-cylinder deadbolt for residential entries 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