6 1/2 Inch Traditional Doctor's Door Knocker: measures 6 1/2 inches tall with a width of 2 inches. This knocker has a projection of 2 3/4 inches and it mounts with a hole center to center distance of 4 inch. Comes complete with the mounting hardware. Solid Brass construction for decades of service. Available in Brass, Antique Brass, Oil Rubbed Bronze (shown), Satin Nickel and Polished Nickel.