If your door knob set is acting up or broken, this E 28318 mortise style fluted glass door knob set is the perfect choice for updating and fixing hardware on interior doors. With a beautiful and classic fluted glass and matte black finish, it's the perfect choice for your antique or vintage interior doors. Installation is a breeze, and the glass door knob set features 2 in. outside diameter knobs. These door knobs are for interior use only, and includes a 17/64 in. x 3-1/2 in. steel spindle with 3/8 in. -20 threads. This classic style door knob set fits square drive spindle systems commonly found in antique and vintage door hardware sets, and it can adjust to accommodate different door thicknesses. The die-cast base on these knobs includes the set screws for fastening the knobs to the square spindle, but it does not include any of the following components and they must be purchased separately - internal mortise lock body, door rosettes, trim and strike plates, or the latch and fasteners. For bronze rosettes see Prime-Line's model number E 2543. Prime-Line Products does not currently manufacture a matching latch bolt, but you might consider using model number E 2497 which is a complete vintage mortise lock set in a bronze finish. Note - this item cannot be used on bored doors that have large, newer style doorknob holes without first prepping them to receive this hardware.