Arched Georgian Roped Backplate Door Set with Fluted Crystal Door Knobs (Several Finishes Available)2 1 3 inch Diameter (point to point) Fluted Crystal Knobs 12 inches Tall by 3 inches Wide Backplates 2 3 8 Inch Backset Included (2 3 4 inch available at request) Passage & Privacy Sets Include All Functional Hardware Needed Double Dummy Set is Non Functional Mounting Hardware Included Glass doorknobs originated in the early 19th century and gained widespread popularity in the late 1800s and early 1900s, particularly in the United States and Europe.