Check the listing for details. 4 Pack Key Entry Door Knob Interior, Black. Condition: New. Listed at 61.18 USD. The interior doorknobs are perfect for rooms that require privacy, such as bedrooms and bathrooms. It is also suitable for wooden, aluminum composite, and colored steel doors. The clean, smooth lines of the privacy door handle complement the interior doors in your home.SpecificationColor: BlackMaterial: Stainless steelCenter distance: 60-70mm/2.4-2.8inchApplicable Door Thickness: 30-50mm/1.2-2inchCenter opening size: 48-60mm/1.9-2.4inchSide opening size: 22-25mm/0.9-1inchPacking List: Privacy Door Knobs x 4AdvantageThe latch can be locked by pushing the button on the inside and turning the handle to unlock. The emergency unlocks the door from the outside. Smoothly opens and closes the door, reducing the noise caused by opening and closing the door, so that your family can sleep all night long.