If your door knob set is acting up or broken, this E 28315 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 satin nickel 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 inch-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 diecast base on these knobs include 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 - The internal mortise lock body, the door rosettes, the trim and strike plates, or the latch and fasteners. For matching rosettes see Prime-Line's model number E 2542. Prime-Line Products does not currently manufacture a matching latch bolt, but you might consider using their model number E 2440 which comes in a chrome finish, or model numbers E 2496 and E 2330 which are complete vintage mortise lock sets in a satin nickel finish. Note - This item cannot be used on pre-bored doors that have large, newer style doorknob holes without first prepping them to receive this hardware.