Porcelain Door Knobs
A door knob set that does not lock. Passage function door knobs are used on closet and hallway doors.
A door knob set that can lock from the inside with a push button or turn piece to allow privacy.
Single mounted knob that performs no function. Single dummy knobs are commonly used on pantry and hallway doors in association with a ball catch.
Two knobs, one mounted to each side of a door. Commonly used on pantry and hallway doors where a push/pull could occur from either side. A fully dummy set is often used in association with a ball catch.