Traditional 6 1/2 Inch Brass Doctor's Door Knocker (Several Finishes Available)6 1 2 Inches Tall by 2 Inches Wide 2 3 4 Inches Projection 4 inch Center to Center Mounting Distance Solid Brass Mounting Hardware Included Doctor door knockers, also known as "Doctor's knockers," are a specific style of door knocker traditionally associated with professional offices and residences of doctors. The style dates back to the 18th and 19th centuries in Britain, where such knockers were commonly found on the doors of physicians, surgeons,