FunctionWhat's this?Passage: Used where doors to not need to lock. Typical usage are closets and child bedrooms.Privacy: Used where doors need to lock from the inside, but where there is no key to unlock from the outside. Typical usage are bathrooms and bedrooms.Keyed: Used where doors need to lock and where a key is needed to unlock or lock from the outside. Typical usage are entry doors or locked storage rooms.Single Dummy: Used where doors need surface mount hardware only. Typical usage are bifold closet doors or decorative only applications.Double Dummy: Same as a single dummy but with two pieces for a surface mount front and back application.Dummy Set: Used where doors need non-functional hardware but where the door is drilled out.
Beautiful and solid, high quality door knob. Very happy with this find for our 100 year old prairie style front porch door. I look forward to see how it ages with use.