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Kaiying Matte Black Keyless Privacy Door Knob, Black Bedroom Door Knobs. Customizable Door Thickness: Available for 35-45mm, 50-55mm, and 55mm+ door thicknesses. Multiple Finish Options: Satin nickel finish with other finishes available upon request. Adjustable Backset: Backset adjustable to 60mm or 70mm for versatile installation. Rose Set Options: Available in 65mm or 75mm rose set options. Premium Materials: Constructed from Stainless Steel 304/201 or Brass. OEM Service Available: Full OEM customization services provided by Kaiying. Quality Assurance: Pre-production samples and 100% final inspection before shipment. Flexible Customization: Options for customization from samples, designs, and minor tweaks.