N2LOK Uovo Privacy Door Knob Round Box Pack Privacy Knob is used for internal doors that require locking. (e.g. bathrooms, bedrooms, and any room where privacy is needed) Privacy Knob Function - can be locked by a button or a turn piece on the inside with no key function. Features: Made of solid forged brass substrate for enduring style & strength Forged brass is 250% stronger than cast brass Specification Function: Privacy Backset: 60mm to 70mm Door Thickness: 35mm to 45mm Available Finishes: Matte Black Polished Brass Polished Chrome Satin Nickel Venetia Bronze Note: N2lok strives to provide you with consistently outstanding quality. We only source from vendors who have been audited to achieve world's best workplace practices and meet or surpass ISO 9001 certification. All our products come with a 7 year mechanical warranty and a 5 year finish warranty (Our living finishes: Matte black & Venetian bronze are only a 12 month finish warranty while Satin Brass in not covered by warranty).