Probrico Privacy/Passage Door Knob, Brushed Nickel Door Knobs, Oval Interior No-Locking Door Knobs, Indoor Door Handle for Bedroom/Bathroom/Hallway/Closets

with lock function but keyless, you could locked inside, but can't open outside as there is no key. Usually used on interior doors where a privacy locking function is required, such as a bedroom/bathroom. Note: Opened with a Coin by an exterior emergency Coin Hole.

No key and can't be locked, but has the latch,so just turn to open. Usually used on interior doors requiring no locking functionality, such as hallway or closet door handles

1 key could open all locks, very convenient. (3 keys included for each lock)For use on exterior doors where one sided is keyed entry and security is needed, such as front door, entry/entrance door, privacy bedroom and bathroom or outside door.

Different key to open each lock. (3 keys included for each lock)For use on exterior doors where one sided is keyed entry and security is needed, such as front door, entry/entrance door, privacy bedroom and bathroom or outside door.

Non-functional & inactive, only single knob(no latch). such as pantry/closet/hallway/french doors.