Georgian Roped Rosette Door Set with Fluted Crystal Door Knobs (Several Finishes Available)2 1 3 inch Diameter Fluted Crystal Knobs 2 1 2 inch Diameter Round Solid Brass Rosettes 2 3 8 Inch Backset Included (2 3 4 inch available at request) Fits Standard 1 3 8 inch Door Thickness Passage & Privacy Sets Include All Functional Hardware Needed Single & 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,