EASY INSTALLATION: Set up your knob set quickly and easily! All you need is a door and a basic tool kit—no professional installation required! PRIVACY FUNCTION: This door knob can be locked from the inside and opened from the outside in an emergency without the need for keys. Perfect for guest rooms, bedrooms, bathrooms, and other interior doors requiring privacy. ONE SIZE FITS MOST: Designed to fit doors ranging from 1-3/8" to 1-3/4" thick, this brozen door knob is reversible for both left- and right-handed doors. (Note: The latch plate is not removable.) CLASSIC DESIGN: More than just a door knob, it’s a statement piece! With no protruding flanges, screws, or rough edges, these elegant knobs ensure safe and easy operation while adding a touch of sophistication to your home. DURABLE QUALITY: Made from solid steel and stainless steel, this knob features a smooth finish and polished look. Its substantial design provides an easy-to-grasp grip, enhancing both commercial and residential spaces. Specifications: Backset: 2.36 or 2.76 inches (60mm or 70mm) Door Thickness: 1.38 ~ 1.77 inches (35mm ~ 45mm) Edge Bore: 0.44 inches (11.2mm) Bore Hole: 2.125 inches (53.98mm)