1Black Pottery Knob Ornate Iron Shank Branford Hardware BLW-028August 17, 2015/in Branford Lock Works Hardware, Porcelain & Bennington Door Knobs/by adminBlack glazed pottery knobs with ornate cast iron shanks in very nice condition By Branford Lock Works. Shank diameter 5/8″ and take a 1/4″ bar.