The Brinks Push Pull Rotate Glenshaw Satin Nickel Privacy Lock is made with superior craftsmanship, Push Pull Rotate door locks have dual torsion springs for smooth rotation, hidden screws for a more decorative appearance, 75mm diameter roses to hide the blemish from old hardware, and removable interior knobs or levers for scratch-free installation. They also come with a lifetime warranty for defects in material or workmanship.