Forged, solid brass backplates. Porcelain, solid brass, and lead crystal antique doorknob styles. This period door hardware is built to last.In vintage hardware designs from the 1890s to the 1950s, most of our exclusive Interior Door Sets are compatible with old mortise locks and doors with a modern 2-1/8" bore. Door Sets Include: 2 backplates, 1 doorknob spindle, and 2 brass or crystal doorknobs (add $30 for glass knobs). Extra Backplate Options: Choose from plain, keyhole, or thumbturn functions, and add passage or privacy latches. Forged Solid Brass: Stronger and more detailed, won't deform or dent. Mix and Match: Personalize by combining different doorknobs and backplates. Six Brass Finishes: (Unlacquered brass, lacquered brass, burnished antique brass, oil-rubbed bronze, polished nickel, brushed nickel) Specify for each side of your doors to match Lighting, Coverplates, and other hardware.