【Privacy Door lever】Keyless door handle. Can be locked/unlocked by thumb turn button inside & by any flat thing outside in emergency(like a coin or card). It can not only protect the privacy of the room owner, but also protect their safety in emergency. Usually used for guest rooms, bedrooms, bathrooms, kitchen, shower 【Reversible】Both left and right handed 【Material & Door Thickness】Material: Zinc Alloy. Door Thickness: from 1-3/8''to 1-3/4''(35mm-45mm). Brass Backset: adjustable 2-3/8''and 2-3/4''(60mm/70mm) 【Durable Surface】Our Matte Black finish is sturdy that can last many years without chip off. It can also protect the surface of the door lever set, and the brass latch is not easy to rust, it's oiled that can extend the life of hardwares 【Easy to Install】The interior/exterior lever door handle is easy to install with a screwdriver. All door lock hardwares are included