The From the Anvil Octagonal Centre Door Knob Black is fitted to the external face of the door - it is used to assist in pulling the door closed. The knob size is 80mm, the rose diameter is 95mm and the projection is 80mm. The centre door knob is sold individually and comes complete with fixings. Black Centre Door Knob The knob has a black finish - this is baked in a high-temperature oven to give it good durability and can be used internally or externally. To remove dirt deposits, simply wipe over with a lightly oiled cloth from time-to-time and this will restore it to its original condition...