PREMIUM MATERIAL: This flat ball style privacy knob is sturdy and stable which is made of premium quality stainless steel, matte black finish, rust-free in a high humidity environment SPECIFICATION: Fits standard door thickness: 1-3/8"to 1-3/4"(35mm-45mm) and adjustable latch 2-3/8"or 2-3/4"(60mm or 70mm), the latch plate is non-detachable, Black Door handle come with a round strike plate, allows you to replace your existing one PRIVACY FUNCTION: Privacy door knob inside with thumb turning button and outside can unlock the door in emergency with a coin or slotted screwdriver, no key is needed WIDE APPLICATION: This interior door knobs is reversible for both left handed and right handed doors. Designed to completed both conventional and modern style interior doors for bathrooms, bedrooms, offices, rooms or other places privacy required EASY INSTALLATION: Door knob lockset have installation instruction and necessaries fitting components in package, will help you to install it more better, installation in just a few minutes to save your time Privacy Door Knobs, RAZCC 4 Pack Matte Black Door Knobs with Lock, Bed and Bath Door Knob Interior Keyless Locksets, Round Door Handles Reversible for Left Right Handed Doors