The keyless interior door knobs are ideal for rooms where the privacy is needed, such as bedrooom or bathroom. This gold round bedroom door knob fits all doors 35mm to 45mm (1-3/8" to 1-3/4") and 60mm to 70mm (2-3/8" to 2-3/4") adjustable latch.Reversible for both left handed and right handed doors. (Notice: The latch plate is unremovable.) The gold door knobs are confirmed with ANSI Grade 3 which exceeds 200,000 cycles.The reversible knob can be rotated to work in both directions way for right or left door. Straightfoward installation with pre-existing hole requiring only a screwdriver. The keyless indoor door knob can lock from the inside with a turn button and unlock from the outside with a coin or flat piece of metal in emergency. [After-sales Service] If there is any quality problem with our products or you don't konw how to install, please contact us and we will response within 12 hours to give you a satisfactory answer, we offer 365-day money back for any reason. Decorate your home