The From the Anvil Windsor Door Knocker Black is designed for the larger door and is hand forged in one piece. The ring width is 126mm, the ring length is 160mm, the fixing plate size is 105mm and the stud diameter is 28mm. Sold individually, it comes complete with fixings. Black Knocker The knocker 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.