Our range of black door knobs is selected from Kirkpatrick, Ludlow Foundries & From The Anvil. There are two main types of door knob: Mortice Knobs and Rim Knobs. Your choice depends on the lock or latch they are to be used with. Mortice locks are cut into the edge of the door and rim locks sit on the face of the door. Several door knobs are suitable for either function but many are not, so we have separated them for you. Where a door knob is dual purpose we have put it in both categories so you can be sure you are getting the correct item to suit your lock.