Egg & Dart Rosette Door Set with Gray Porcelain Door Knobs (Several Finishes Available)2 1 3 Inch in Diameter Genuine Porcelain Knob 3 inch Diameter Round Solid Brass Rosette 2 3 8 Inch Backset Included (2 3 4 inch available at request) Mounting Hardware Included Porcelain doorknobs capture the enduring elegance of a bygone era, with origins dating back to the late 19th century and early 20th century. Brass has been a popular choice for door hardware for centuries, prized for its durability, attractiveness, and craftsmanship. Our