Brand: ProSourceSize: 4-1/4" Wide X 2-11/16" TallFinish: Satin BrassFor Use On Doors 1-3/8" To 2-1/4" ThickBackset: 2-3/8"Double Cylinder, Keyed On Both Inside And Outside, Must Use Key To Lock And UnlockIf Cylinder Is Removed From Outside Of Door, Shutter Guard Will Activate, Preventing Opening Of The Lock With A ScrewdriverRecommended For Doors With Glass Panels, You Can Break Glass Reach In and Turn Knob On Single CylinderKeyed DifferentComes With 2 Keys And Mounting Hardware